ASUR 2Q11 PASSENGER TRAFFIC UP 2.89% YOY

In Mexico ASUR Lic. Adolfo Castro (52) 5552-84-04-08 acastro@asur.com.mx In the U.S. Breakstone Group Susan Borinelli (646) 330-5907 sborinelli@breakstone-group.com ASUR 2Q11 PASSENGER TRAFFIC UP 2.89% YOY For Immediate Release México D.F., July 25, 2011 Grupo Aeroportuario del Sureste, S.A.B. de C.V. (NYSE:ASR; BMV:ASUR), (ASUR) the first privatized airport group in Mexico and operator of Cancún Airport and eight other airports in southeast Mexico, today announced results for the three and six-month periods ended June 30, 2011. 2Q11 Highlights 1 : EBITDA 2 increased by 10.00% to Ps.621.29 million Total passenger traffic was up 2.89% Total revenues increased by 7.07% due to increases of 5.38% in aeronautical revenues, 9.34% in non-aeronautical revenues and 9.39% in construction services revenues Commercial revenues per passenger increased by 8.26% to Ps.66.22 Operating profit rose by 10.69% EBITDA margin increased to 56.76% from 55.25% in 2Q10 1. Unless otherwise stated, all financial figures discussed in this announcement are unaudited, prepared in accordance with Mexican Financial Reporting Standards (MFRS) and represent comparisons between the three and six-month periods ended June 30, 2011, and the equivalent three and six-month periods ended June 30, 2010. Results are expressed in nominal pesos. Tables state figures in thousands of pesos, unless otherwise noted. Passenger figures exclude transit and general aviation passengers. Commercial revenues include revenues from non-permanent ground transportation and parking lots. All U.S. dollar figures are calculated at the exchange rate of US$1 = Ps. 11.7230. 2. EBITDA means net income before: provision for taxes, deferred taxes, profit sharing, nonordinary items, comprehensive financing cost and depreciation and amortization. EBITDA should not be considered as an alternative to net income, as an indicator of our operating performance or as an alternative to cash flow as an indicator of liquidity. Our management believes that EBITDA provides a useful measure of our performance that is widely used by investors and analysts to evaluate our performance and compare it with other companies. EBITDA is not defined under U.S. GAAP or MFRS and may be calculated differently by different companies. ASUR 4Q10, Page 1 of 17

Passenger Traffic For the second quarter of 2011, total passenger traffic increased year-overyear by 2.89%. Domestic passenger traffic rose 5.73% while international passenger traffic increased 0.90%. The 0.90% increase in international passenger traffic resulted mainly from an increase of 1.18% in international traffic at the Cancún airport. The 5.73% increase in domestic passenger traffic was due to increases of 8.44%, 13.77%, 20.73% and 12.20% in domestic traffic at Cancún, Villahermosa, Huatulco and Mérida, respectively. These increases were partially offset by the 18.44%, 22.51%, 9.78% and 5.91% declines in passenger traffic at Oaxaca, Minatitlán, Tapachula and Veracruz. Passenger traffic for 1H11 increased 0.69% compared to 1H10, reflecting increases of 1.48% in domestic passenger traffic and 0.23% in international passenger traffic. Table I: Domestic Passengers (in thousands) Airport 2Q10 2Q11 % Change 1H10 1H11 % Change Cancún 854.3 926.4 8.44 1,545.7 1,624.3 5.09 Cozumel 9.3 9.3-20.4 19.8 (2.94) Huatulco 84.4 101.9 20.73 159.7 178.0 11.46 Mérida 258.1 289.6 12.20 508.2 531.5 4.58 Minatitlán 34.2 26.5 (22.51) 65.2 50.5 (22.55) Oaxaca 100.3 81.8 (18.44) 205.7 151.8 (26.20) Tapachula 45.0 40.6 (9.78) 90.8 77.1 (15.09) Veracruz 211.6 199.1 (5.91) 394.4 373.4 (5.32) Villahermosa 168.5 191.7 13.77 332.8 365.6 9.86 TOTAL 1,765.7 1,866.9 5.73 3,322.9 3,372.0 1.48 Note: Passenger figures exclude transit and general aviation passengers. Table II: International Passengers (in thousands) Airport 2Q10 2Q11 % Change 1H10 1H11 % Change Cancún 2,330.9 2,358.3 1.18 5,204.0 5,220.2 0.31 Cozumel 109.0 102.7 (5.78) 245.4 246.4 0.41 Huatulco 10.6 10.5 (0.94) 53.6 48.6 (9.33) Mérida 23.1 20.1 (12.99) 49.5 47.5 (4.04) Minatitlán 1.4 1.1 (21.43) 2.7 2.1 (22.22) Oaxaca 11.7 10.9 (6.84) 27.0 23.7 (12.22) Tapachula 1.1 2.2 100.00 2.1 4.1 95.24 Veracruz 18.2 23.2 27.47 35.2 41.4 17.61 Villahermosa 11.8 11.5 (2.54) 24.2 22.6 (6.61) TOTAL 2,517.8 2,540.5 0.90 5,643.7 5,656.6 0.23 Note: Passenger figures exclude transit and general aviation passengers. ASUR 2Q11, Page 2 of 17

Table III: Total Passengers (in thousands) Airport 2Q10 2Q11 % Change 1H10 1H11 % Change Cancún 3,185.2 3,284.7 3.12 6,749.7 6,844.5 1.40 Cozumel 118.3 112.0 (5.33) 265.8 266.2 0.15 Huatulco 95.0 112.4 18.32 213.3 226.6 6.24 Mérida 281.2 309.7 10.14 557.7 579.0 3.82 Minatitlán 35.6 27.6 (22.47) 67.9 52.6 (22.53) Oaxaca 112.0 92.7 (17.23) 232.7 175.5 (24.58) Tapachula 46.1 42.8 (7.16) 92.9 81.2 (12.59) Veracruz 229.8 222.3 (3.26) 429.6 414.8 (3.45) Villahermosa 180.3 203.2 12.70 357.0 388.2 8.74 TOTAL 4,283.5 4,407.4 2.89 8,966.6 9,028.6 0.69 Note: Passenger figures exclude transit and general aviation passengers. Consolidated Results for 2Q11 Total revenues for 2Q11 increased year-over-year by 7.07% to Ps.1,094.61 million. This was mainly due to increases of: 5.38% in revenues from aeronautical services, principally as a result of the 2.89% rise in passenger traffic; 9.34% in revenues from non-aeronautical services, reflecting the 10.53% increase in commercial revenues detailed below; and 9.39% increase in revenues from construction services as a result of improvements to its concessioned assets. ASUR classifies commercial revenues as those derived from the following activities: duty-free stores, car rentals, retail operations, banking and currency exchange services, advertising, teleservices, non-permanent ground transportation, food and beverage, and parking lot fees. Commercial revenues increased by 10.53% year-over-year during the quarter, principally due to higher passenger traffic. There were increases in revenues in the following activities: 22.31% in retail operations; 15.58% in parking lot fees; 12.62% in ground transportation; 12.09% in duty-free stores; 3.59% in other revenues; 1.88% in food and beverage; 1.54% in advertising; and ASUR 2Q11, Page 3 of 17

1.33% in banking and currency exchange services. These increases were partially offset by revenue declines of: 43.24% in teleservices; and 2.64% in car rentals. Cancún ASUR 2Q11, Page 4 of 17 Retail and Other Commercial Space Opened During the Last Twelve Months Business Name Type Opening Date Ice Currency exchange September 2010 Telmex Internet booths (18 booths) August & September 2010 Air Shop Convenience store October 2010 Johnny Rockets Food and beverage December 2010 Bubba Gump Food and beverage December 2010 Duty Paid Retailer December 2010 Panamá Jack Convenience store March 2011 Grab & Go Food and beverage April 2011 California Pizza Kitchen Food and beverage April 2011 Veracruz Cardtronics México Currency exchange April 2010 Air Shop Convenience store (2 stores) December 2010 Villahermosa Cardtronics México Currency exchange April 2010 Air Shop Convenience store (2 stores) December 2010 Oaxaca Cardtronics México Currency exchange April 2010 Air Shop Convenience store December 2010 Mérida Cardtronics México Currency exchange April 2010 Air Shop Convenience store (2 stores) November 2010 Cozumel Cardtronics México Currency exchange April 2010 Air Shop Convenience store January 2011 Minatitlán Cardtronics México Currency exchange May 2010 Air Shop Convenience store January 2011

Business Name Type Opening Date Tapachula Cardtronics México Currency exchange May 2010 Air Shop Convenience store January 2011 Huatulco Cardtronics México Currency exchange May 2010 Air Shop Convenience store December 2010 Construction revenues and expenses. As a result of ASUR s adoption of I- MFRS 17, Service Concession Contracts, ASUR is required to include in its income statement an income line reflecting the income from construction or improvements to concessioned assets made during the period. During 2Q11, ASUR recognized Ps.134.94 million in Construction Services because of improvements to its concessioned assets, a 9.39% year-on-year increase. The same amount is recognized under the expense line Construction Costs because ASUR hires third parties to provide construction services. Because equal amounts of Construction Revenues and Construction Expenses have been included in ASUR's income statement as a result of the application of I-MFRS 17, the increase in Construction Revenues in 2Q11 did not result in a proportionate increase in the EBITDA Margin, which is equal to EBITDA divided by total revenues. Total operating costs and expenses for 2Q11 increased 3.93% year-overyear. This was primarily due to the following increases: 2.85% in concession fees paid to the Mexican government, mainly due to the decrease in regulated revenues (a factor in the calculation of the fee); 2.31% in administrative expenses, principally in security and travel expenses; 10.00% in the technical assistance fee paid to ITA, reflecting the increase in EBITDA for the quarter (a factor in the calculation of the fee); 6.37% in depreciation and amortization resulting mainly from higher investments made since 2Q11; and 9.39% in construction costs due to improvements made to the concessioned assets during the period. These increases were partially offset by the 0.43% decline in cost of services. Operating margin for the quarter increased to 48.08% from 46.51% in 2Q10. This was mainly due to the 7.07% increase in revenues, which more than offset the 3.93% increase in expenses during the period. ASUR 2Q11, Page 5 of 17

Comprehensive Financing Cost for 2Q11 declined year-over-year by Ps.11.34 million from Ps.3.5 million in 2Q10. During 2Q11, the Company reported net interest income of Ps.4.4 million, resulting from interest income of Ps.20.0 million and accrued interest expenses of Ps.15.6 million. During the quarter ASUR posted a Ps.0.5 million mark-to-market gain in its interest rate swap and an exchange rate loss of Ps.2.2 million. During 2Q10, ASUR reported net interest income of Ps.4.4 million resulting from interest income of Ps.13.0 million and accrued interest expenses of Ps.8.6 million. This was partially offset by a Ps.0.9 million mark-to-market loss on the Company s interest rate swap and a Ps.14.9 million exchange rate loss. Income Taxes. Following the changes in Mexican tax law that took effect January 1, 2008, which established a new flat rate business tax ( Impuesto Empresarial a Tasa Unica, or IETU ) and eliminated the asset tax, the Company evaluates and reviews its deferred assets and liabilities position under Mexican Financial Reporting Standards. Income taxes for 2Q11 declined by 0.46%, or Ps.0.69 million year-over-year, principally due to the following factors: Provisional IETU payments of Ps.0.8 million caused by some of ASUR s subsidiaries; A Ps.5.5 million increase in the provision for income taxes, because Cancun Airport has paid income taxes instead of IETU since 2010, but in 2010 it still amortized fiscal losses; A Ps.9.4 million decline in deferred income taxes resulting from the recognition of the changes in fiscal depreciation rates beginning in 4Q10; A Ps.3.9 million increase in deferred IETU because of the expiry of tax credits; and A Ps.3.1 million increase in the provision for asset taxes because they cannot be credited against other taxes. Net income for 2Q11 increased 12.04% to Ps.386.18 million from Ps.344.68 million in 2Q10. Earnings per common share for the quarter were Ps.1.2873, or earnings per ADS (EPADS) of US$1.0981 (one ADS represents ten series B common shares). This compares with earnings per share of Ps.1.1489, or EPADS of US$0.0981, for the same period last year. ASUR 2Q11, Page 6 of 17

Table IV: Summary of Consolidated Results for 2Q11 2Q10 2Q11 % Change Total Revenues 1,022,338 1,094,610 7.07 Aeronautical Services 587,983 619,617 5.38 Non-Aeronautical Services 310,995 340,050 9.34 Commercial Revenues 267,018 295,145 10.53 Construction Services 123,360 134,943 9.39 Operating Profit 475,474 526,279 10.69 Operating Margin % 46.51% 48.08% 3.37 EBITDA 564,795 621,291 10.00 EBITDA Margin % 55.25% 56.76% 2.74 Net Income 344,684 386,183 12.04 Earnings per Share 1.1489 1.2873 12.04 Earnings per ADS in US$ 0.9801 1.0981 12.04 Note: U.S. dollar figures are calculated at the exchange rate of US$1 = Ps. 11.7230. Table V: Commercial Revenues per Passenger for 2Q11 2Q10 2Q11 % Change Total Passengers ( 000) 4,366 4,458 2.18 Total Commercial Revenues 267,018 295,145 10.53 Commercial revenues from direct 47,790 63,173 32.19 operations (1) Commercial revenues excluding direct operations 219,228 231,972 5.81 Total Commercial Revenue per Passenger 61.17 66.22 8.26 Commercial revenue from direct 10.95 14.17 29.41 operations per passenger (1) Commercial revenue per passenger (excluding direct operations) 50.22 52.05 3.66 Note: For purposes of this table, approximately 82,800 and 51,100 transit and general aviation passengers are included for 2Q10 and 2Q11, respectively. (1) Revenues from direct commercial operations in 2Q11 represent ASUR s operation of 25 convenience stores in airports and the direct sale of advertising space. ASUR 2Q11, Page 7 of 17

Table VI: Operating Costs and Expenses for 2Q11 2Q10 2Q11 % Change Cost of Services 220,921 219,977 (0.43) Construction Costs 123,360 134,943 9.39 Administrative 40,082 41,007 2.31 Technical Assistance 29,726 32,700 10.00 Concession Fees 43,454 44,692 2.85 Depreciation and Amortization 89, 321 95,012 6.37 TOTAL 546,864 568,331 3.93 Consolidated Results for 1H11 Total revenues for 1H11 increased year-over-year by 3.37% to Ps.2,157.5 million, mainly due to the following increases: 3.64% in revenues from aeronautical services as a result of the 0.69% increase in passenger traffic during the period; and 7.25% in revenues from non-aeronautical services, principally as a result of the 8.12% rise in commercial revenues detailed below. These increases were partially offset by a 9.54% decline in revenues from construction services. Commercial revenues for 1H11 rose by 8.12% year-over-year, principally as a result of revenue increases in the following areas: 15.50% in retail operations; 10.39% in parking lot fees; 10.62% in duty-free stores; 2.77% in ground transportation services; 7.11% in advertising. 1.66% in other income; and 2.33% in food and beverage. These increases were partially offset by revenue declines in the following areas: 47.67% in teleservices; 1.94% in car rentals; and 0.52% in banking and currency exchange services. Total operating costs and expenses for 1H11 rose 1.29%, mainly due to the following increases: 2.15% in administrative expenses, principally telephone service, security, and travel expenses; ASUR 2Q11, Page 8 of 17

4.27% in cost of services, mainly reflecting the higher energy, security, maintenance and cleaning costs. Costs in connection with the opening of convenience stores directly operated by the Company at its airports beginning in November 2010 also contributed to the increase. 5.50% in technical assistance costs, reflecting the corresponding increase in EBITDA during the period; 1.06% in concession fees, mainly due to the increase in regulated revenues (a factor in the calculation of the fee); and 5.96% in depreciation and amortization mainly due to changes in the depreciation and amortization rates. Construction costs, in turn, declined by 9.54% year-on-year. Operating margin increased to 51.42% for 1H11, from 50.42% in 1H10. This was mainly the result of the 3.37% increase in revenues which more than offset the 1.29% increase in administrative expenses for the period. Net income for 1H11 increased by 4.03% to Ps.806.39 million. Earnings per common share for the period were Ps.2.6880, or earnings per ADS (EPADS) of US$2.2929 (one ADS represents ten series B common shares). This compares with Ps.2.5838, or EPADS of US$2.2040, for the same period last year. Table VII: Summary of Consolidated Results for 1H11 (in thousands) 1H10 1H11 % Change Total Revenues 2,087,071 2,157,507 3.37 Aeronautical Services 1,227,427 1,272,096 3.64 Non-Aeronautical Services 641,977 688,520 7.25 Commercial Revenues 554,467 599,504 8.12 Construction Services 217,667 196,891 (9.54) Operating Profit 1,052,265 1,109,304 5.42 Operating Margin % 50.42% 51.42% 1.98% EBITDA 1,230,799 1,298,487 5.50 EBITDA Margin % 58.97% 60.18% 2.06% Net Income 775,131 806,388 4.03 Earnings per Share 2.5838 2.6880 4.03 Earnings per ADS in US$ 2.2040 2.2929 4.03 Note: U.S. dollar figures are calculated at the exchange rate of US$1 = Ps. 11.7230. ASUR 2Q11, Page 9 of 17

Table VIII: Commercial Revenues per Passenger for 1H11 (in thousands) 1H10 1H11 % Change Total Passengers *( 000) 9,146 9,135 (0.12) Total Commercial Revenues 554,467 599,504 8.12 Commercial revenues from 99,200 125,806 26.82 direct operations (1) Commercial revenues excluding direct operations Total Commercial Revenue per Passenger 455,267 473,698 4.05 60.62 65.63 8.26 Commercial revenue from 10.85 13.77 26.91 direct operations per passenger (1) Commercial revenue per passenger (excluding direct operations) 49.77 51.86 4.20 * For purposes of this table, approximately 179,500 and 106,100 transit and general aviation passengers are included for 1H10 and 1H11, respectively. (1) Revenues from direct commercial operations represent only ASUR s operation of convenience stores as well as the direct sale of advertising space by the Company. Table IX: Operating Costs and Expenses for 1H11 (in thousands) 1H10 1H11 % Change Cost of Services 405,393 422,712 4.27 Construction Costs 217,667 196,891 (9.54) Administrative 78,590 80,281 2.15 Technical Assistance 64,779 68,341 5.50 Concession Fees 89,843 90,795 1.06 Depreciation and Amortization 178,534 189,183 5.96 TOTAL 1,034,806 1,048,203 1.29 Tariff Regulation The Mexican Ministry of Communications and Transportation regulates the majority of ASUR s activities by setting maximum rates, which represent the maximum possible revenues allowed per traffic unit at each airport. ASUR s regulated revenues for 1H11 were Ps.1,338.11 million, resulting in an annual average tariff per workload unit of Ps.143.70. ASUR s regulated revenues accounted for approximately 62.02% of total income for the period. ASUR 2Q11, Page 10 of 17

The Mexican Ministry of Communications and Transportation reviews compliance with the maximum rates on an annual basis at the close of each year. Balance Sheet On June 30, 2011, Airport Concessions represented 81.26% of the Company s total assets, with current assets representing 15.68% and other assets representing 3.06%. Cash and cash equivalents on June 30, 2011 were Ps.1,366.44 million, 131.33% above the Ps.590.69 million in cash and cash equivalents recorded on June 30, 2010. Shareholders equity at the close of 2Q11 was Ps.14,701.85 million and total liabilities were Ps.3,644.58 million, representing 80.13% and 19.87% of total assets, respectively. Total deferred liabilities represented 62.09% of the Company s total liabilities. Total bank debt at June 30, 2011 was Ps.831.5 million, including Ps.1.0 million in accrued interest. During August and September of 2010, Cancun Airport entered into two three-year credit agreements of Ps.350 million and Ps.570 million with two banks. The terms of the agreement include a floating interest rate based on the Tasa de Interes Interbancaria de Equilibrio (TIIE) plus 1.5% and quarterly principal payments. During the quarter, ASUR made principal payments of Ps.29.2 million in connection with the Ps.350 and 570 million three-year credit agreements. During August 2010 ASUR purchased a hedge against the risk of a significant increase in TIIE. The Company is hedged for 32% of the interest rate exposure under its Ps.350 and 570 million credit agreements. The interest rate was fixed for three years at 6.37%, 6.33% and 6.21% 1. The interest rate hedge during the quarter resulted in a Ps.0.5 million gain. ASUR 2Q11, Page 11 of 17

Capital Expenditures During 2Q11, ASUR made investments of Ps.109.45 million as part of ASUR s ongoing plan to modernize its airports pursuant to its master development plans. Recent Events Adolfo Castro Assumes CEO Position at ASUR; Fernando Chico Pardo Remains Chairman On May 26, 2011, ASUR announced that Mr. Adolfo Castro was named Chief Executive Officer effective June 1, 2011 and that Mr. Fernando Chico Pardo, the Chairman and CEO, will remain Chairman of the Company and President of the Nominations and Compensation, Operations, and Acquisitions and Contracts Committees. The Company s Board of Directors received and accepted Mr. Fernando Chico Pardo s resignation as Chief Executive Officer and approved the proposal presented by its Nominations and Compensations Committee to name Adolfo Castro to the position of Chief Executive Officer. ASUR s Board of Directors expects to name a new Chief Financial and Strategic Planning Officer shortly. In the interim, Mr. Castro will continue to oversee the financial and strategic planning areas of the Company. 2Q11 Earnings Conference Call Day: Tuesday, July 26, 2011 Time: 10:00 AM US EST; 9:00 AM Mexico City time Dial-in number: 888.713.4211 (US & Canada) and 617.213.4864 (International & Mexico) Access Code: 18955383 Pre-registration: If you would like to pre-register for the conference call use the following link: https://www.theconferencingservice.com/prereg/key.process?key=pbebkarfx Pre-registering is not mandatory but is recommended as it will provide you immediate entry into the call and will facilitate the timely start of the conference. You will receive a code that allows you to enter the call directly. Preregistration only takes a few moments, and you may do so ASUR 2Q11, Page 12 of 17

at any time, including up to and after call start time. To preregister, please click the link above. Alternatively, if you would rather be placed into the call by an operator, please call at least 10 minutes prior to call start time. Replay: Starting Tuesday, July 26, 2011 at 12:00 PM US ET, ending at midnight US ET on Tuesday, August 2, 2011. Dial-in number: 888-286-8010 (US & Canada); 617-801-6888 (International & Mexico). Access Code: 58205801. About ASUR: Grupo Aeroportuario del Sureste, S.A.B. de C.V. (ASUR) is a Mexican airport operator with concessions to operate, maintain and develop the airports of Cancún, Mérida, Cozumel, Villahermosa, Oaxaca, Veracruz, Huatulco, Tapachula and Minatitlán in the southeast of México. The Company is listed both on the NYSE in the U.S., where it trades under the symbol ASR, and on the Mexican Bolsa, where it trades under the symbol ASUR. One ADS represents ten (10) series B shares. Some of the statements contained in this press release discuss future expectations or state other forward-looking information. Those statements are subject to risks identified in this press release and in ASUR s filings with the SEC. Actual developments could differ significantly from those contemplated in these forward-looking statements. The forward-looking information is based on various factors and was derived using numerous assumptions. Our forward-looking statements speak only as of the date they are made and, except as may be required by applicable law, we do not have an obligation to update or revise them, whether as a result of new information, future or otherwise. # # # TABLES TO FOLLOW # # # ASUR 2Q11, Page 13 of 17

Item Grupo Aeroportuario del Sureste, S.A.B. de C.V. Operating Results per Airport Thousands of Mexican pesos 2Q 2010 2Q 2010 Per Workload Unit 2Q 2011 2Q 2011 Per Workload Unit Cumulative 2010 Cum 2010 Per Workload Unit Cumulative 2011 Cum 2011 Per Workload Unit Cancún (1) Aeronautical Revenues 434,108 133.0 461,221 137.7 918,344 133.2 961,319 137.8 Non-Aeronautical Revenues 270,192 82.8 299,386 89.4 561,290 81.4 609,501 87.4 Construction Services 42,826 13.1 59,208 17.7 62,359 9.0 91,187 13.1 Total Revenues 747,126 228.9 819,815 244.8 1,541,993 223.7 1,662,007 238.2 Operating Profit 342,783 105.0 337,684 100.8 826,045 119.8 861,719 123.5 EBITDA 401,930 123.1 399,958 119.4 944,321 137.0 985,434 141.2 Mérida Aeronautical Revenues 38,894 116.8 44,466 123.2 76,616 116.6 83,141 122.4 Non-Aeronautical Revenues 12,612 37.9 12,142 33.6 24,245 36.9 23,288 34.3 Construction Services 35,888 107.8 19,070 52.8 82,057 124.9 28,965 42.7 Other (2) 10,000 30.0 - - 10,000 15.2 - - Total Revenues 97,394 292.5 75,678 209.6 192,918 293.6 135,394 199.4 Operating Profit 17,512 52.6 16,392 45.4 31,879 48.5 31,954 47.1 EBITDA 24,229 72.8 24,176 67.0 45,312 69.0 47,524 70.0 Villahermosa Aeronautical Revenues 20,951 110.9 24,239 113.3 41,073 110.1 45,799 112.3 Non-Aeronautical Revenues 7,507 39.7 8,435 39.4 15,110 40.5 16,997 41.7 Construction Services 5,793 30.7 4,203 19.6 11,038 29.6 4,871 11.9 Other (2) - - - - - - - - Total Revenues 34,251 181.2 36,877 172.3 67,221 180.2 67,667 165.9 Operating Profit 5,835 30.9 6,454 30.2 12,560 33.7 16,539 40.5 EBITDA 10,471 55.4 11,192 52.3 21,829 58.5 26,018 63.8 Other Airports (3) Aeronautical Revenues 94,030 143.6 89,691 143.0 191,394 143.3 181,837 145.8 Non-Aeronautical Revenues 20,684 31.6 20,087 32.0 41,332 30.9 38,734 31.1 Construction Services 38,617 59.0 52,462 83.7 61,819 46.3 71,868 57.6 Other (2) - - 19,000 30.3 - - 22,431 18.0 Total Revenues 153,331 234.1 181,240 289.1 294,545 220.5 314,870 252.5 Operating Profit 141,052 215.3 35,688 56.9 176,289 132.0 68,721 55.1 EBITDA 159,761 243.9 55,576 88.6 213,619 159.9 108,493 87.0 Holding & Service Companies (4) Construction Services 236 n/a - n/a 394 n/a - n/a Other (2) 260,864 n/a 304,273 n/a 427,093 n/a 443,314 n/a Total Revenues 261,100 n/a 304,273 n/a 427,487 n/a 443,314 n/a Operating Profit (31,708) n/a 130,061 n/a 5,492 n/a 130,371 n/a EBITDA (31,596) n/a 130,389 n/a 5,718 n/a 131,018 n/a Consolidation Adjustment Consolidation Adjustment (270,864) n/a (323,273) n/a (437,093) n/a (465,745) n/a Group Aeronautical Revenues 587,983 132.4 619,617 136.1 1,227,427 132.6 1,272,096 136.6 Non-Aeronautical Revenues 310,995 70.0 340,050 74.7 641,977 69.3 688,520 73.9 Construction Services 123,360 27.8 134,943 29.7 217,667 23.5 196,891 21.1 Total Revenues 1,022,338 230.2 1,094,610 240.5 2,087,071 225.4 2,157,507 231.7 Operating Profit 475,474 107.1 526,279 115.6 1,052,265 113.6 1,109,304 119.1 EBITDA 564,795 127.2 621,291 136.5 1,230,799 132.9 1,298,487 139.5 ASUR 2Q11, Page 14 of 17 (1) Reflects the results of operations of Cancun Airport and two Cancun Airport Services subsidiaries on a consolidated basis. (2) Reflects revenues under intercompany agreements which are eliminated in the consolidation adjustment. (3) Reflects the results of operations of our airports located in Cozumel, Huatulco, Minatitlan, Oaxaca, Tapachula and Veracruz. (4) Reflects the results of operations of our parent holding company and our services subsidiaries. Because none of these entities hold the concessions for our airports, we do not report workload unit data for theses entities.

Grupo Aeroportuario del Sureste, S.A.B. de C.V. Consolidated Balance Sheet as of June 30, 2011 and 2010 Thousands of Mexican pesos I t e m June 2010 June 2011 Variation % A s s e t s Current Assets Cash and Cash Equivalents 590,693 1,366,441 775,748 131.33 Trade Receivables, net 384,615 368,387 (16,228) (4.22) Recoverable Taxes and Other Current Assets 1,048,915 1,139,690 90,775 8.65 Total Current Assets 2,024,223 2,874,518 850,295 42.01 Fixed Assets Machinery, Furniture and Equipment, net 304,022 306,654 2,632 0.87 Rights to Use Airport Facilities, net - - - - Improvements to Use Airport Facilities, net - - - - Construction in Process - - - - Others - - - - Total Fixed Assets 304,022 306,654 2,632 0.87 Deferred Assets Airports Concessions, net 14,646,907 14,908,925 262,018 1.79 Deferred Income Taxes - - - - Deferred IETU 188,985 206,019 17,034 9.01 Other 98,427 50,312 (48,115) (48.88) Total Deferred Assets 14,934,319 15,165,256 230,937 1.55 Total Assets 17,262,564 18,346,428 1,083,864 6.28 Liabilities and Stockholders' Equity Current Liabilities Trade Accounts Payable 20,906 13,381 (7,525) (35.99) Notes Payable - - - - Bank Loans 96,962 368,975 272,013 280.54 Accrued Expenses and Others Payables 450,314 536,805 86,491 19.21 Total Current Liabilities 568,182 919,161 350,979 61.77 Long Term Liabilities Concession Fee - - - - Bank Loans 90,642 462,504 371,862 410.25 Deferred Income Taxes 1,518,725 1,432,569 (86,156) (5.67) Deferred Flat Rate Business Tax 766,401 816,864 50,463 6.58 Deferred Employees Profit Sharing - - - - Labor Obligations 10,483 13,484 3,001 28.63 Total Long Term Liabilities 2,386,251 2,725,421 339,170 14.21 Total Liabilities 2,954,433 3,644,582 690,149 23.36 Stockholders' Equity Capital stock 12,799,204 12,799,204 - - Legal Reserve 287,117 350,875 63,758 22.21 Share Repurchase Reserve - - - - Net Income for the Period 775,131 806,388 31,257 4.03 Retained Earnings 446,679 745,379 298,700 66.87 Total Stockholders' Equity 14,308,131 14,701,846 393,715 2.75 Total Liabilities and Stockholders' Equity 17,262,564 18,346,428 1,083,864 6.28 ASUR 2Q11, Page 15 of 17

Grupo Aeroportuario del Sureste, S.A.B. de C.V. Consolidated Statement of Income from January 1 to June 30, 2011 and 2010 Thousands of Mexican pesos I t e m Cumulative Cumulative Variation 2nd. Quarter 2nd. Quarter Variation 2010 2011 % 2010 2011 % Revenues Aeronautical Services 1,227,427 1,272,096 3.64 587,983 619,617 5.38 Non-Aeronautical Services 641,977 688,520 7.25 310,995 340,050 9.34 Construction Services 217,667 196,891 (9.54) 123,360 134,943 9.39 Total Revenues 2,087,071 2,157,507 3.37 1,022,338 1,094,610 7.07 Operating Expenses Cost of Services 405,393 422,712 4.27 220,921 219,977 (0.43) Cost of Construction 217,667 196,891 (9.54) 123,360 134,943 9.39 General and Administrative Expenses 78,590 80,281 2.15 40,082 41,007 2.31 Technical Assistance 64,779 68,341 5.50 29,726 32,700 10.00 Concession Fee 89,843 90,795 1.06 43,454 44,692 2.85 Depreciation and Amortization 178,534 189,183 5.96 89,321 95,012 6.37 Total Operating Expenses 1,034,806 1,048,203 1.29 546,864 568,331 3.93 Operating Income 1,052,265 1,109,304 5.42 475,474 526,279 10.69 Comprehensive Financing Cost 13,432 7,102 (47.13) 18,442 7,104 (61.48) Non-Ordinary Item Non-Ordinary Item 676 (677) (200.15) 670 (677) (201.04) Income Before Income Taxes 1,065,021 1,117,083 4.89 493,246 534,060 8.27 Provision for IETU 5,146 7,434 44.46 3,030 (821) (127.10) Provision for Income Tax 234,383 311,097 32.73 135,319 140,886 4.11 Provision for Asset Tax - 5,210 - - 3,126 - Deferred Income Taxes 37,768 (28,520) (175.51) 4,282 (5,132) (219.85) Deferred IETU 12,593 15,474 22.88 5,931 9,818 65.54 Net Income for the Year 775,131 806,388 4.03 344,684 386,183 12.04 Earnings per share 2.58 2.69 4.03 1.1489 1.2873 12.04 Earnings per American Depositary Share (in U.S. Dollars) 2.20 2.29 4.03 0.9801 1.0981 12.04 Exchange rate per dollar Ps. 11.723 ASUR 2Q11, Page 16 of 17

Grupo Aeroportuario del Sureste, S.A.B. de C.V. Consolidated Statement of Cash Flow from January 1 to June 30, 2011 and 2010 Thousands of Mexican pesos Related Cumulative Cumulative Variation 2nd. Quarter 2nd. Quarter Variation 2010 2011 % 2010 2011 % Operating Activities Income Before Income Taxes 1,065,021 1,117,083 5 493,246 534,060 8 Items Related to Investing Activities: Depreciation and Amortization 178,534 189,183 6 89,321 95,012 6 Loss on Disposal of Fixed Assets 16,908 (100) (18,940) (100) Interest Income (5,654) (40,186) 611 (3,455) (20,024) 480 Provisions - (34,179) - - (69,821) - - - Sub-Total 1,254,809 1,231,901 1 560,172 539,227 2 Increase in Trade Receivables (9,450) 21,573 (328) 121,517 68,080 (44) Decrease in Recoverable Taxes and other Current Assets (6,601) 34,096 777 45,990 167,033 63 Other Deferred Assets - - - (19,025) (100) Income Tax Paid (5,146) (100) (5,146) - (100) Trade Accounts Payable - 2,643 - (1,103) (1,607) 46 Accrued Expenses and Others Payables 17,047 12,190 311 35,344 62,236 240 Long Term Liabilities - - (3,796) (1,000) (74) Net Cash Flow Provided by Operating Activities 1,250,659 1,302,404 4 733,953 833,970 14 Investing Activities Investments in Machinery, Furniture and Equipment, net (180,916) (160,694) (11) (158,210) (37,219) (76) Investments in Rights to Use Airport Facilities - - - - - Investments in Construction in Process (108,060) (100) (3,853) (56,922) 1,377 Investments in Others 71,310 (100) 38,704 (15,306) (140) Interest Income 5,654 40,186 611 3,455 20,024 480 Net Cash Flow Provided by Investing Activities (212,013) (120,508) (43) (119,905) (89,423) (25) Excess Cash to Use in Financing Activities: 1,038,647 1,181,896 14 614,049 744,547 21 Bank Loans (363,637) (58,334) (84) (309,091) (29,167) (91) Dividends Paid (750,000) (900,000) 20 (750,000) (900,000) 20 Tax on dividends Paid (295,720) (300,000) 1 (295,720) (300,000) 1 Net Cash Flow Provided by Financing Activities (1,409,357) (1,258,334) (11) (1,354,811) (1,229,167) (9) Net Increase in Cash and Cash Equivalents (370,711) (76,438) (79) (740,763) (484,620) (35) Cash and Cash Equivalents at Beginning of Period 961,404 1,442,879 50 1,331,456 1,851,061 39 Cash and Cash Equivalents at the End of Period 590,693 1,366,441 131 590,693 1,366,441 131 ASUR 2Q11, Page 17 of 17