Fly Quiet Program Chicago O Hare International Airport

4 th Quarter 27 Report Fly Quiet Program Chicago O Hare International Airport Visit the O Hare Noise Webpage on the Internet at www.flychicago.com/ordnoise

4 th Quarter 27 Report BACKGROUND On June 7, 997, the City of Chicago announced that airlines operating at O Hare International Airport had agreed to use designated noise abatement flight procedures in accordance with the Fly Quiet Program. The Fly Quiet Program was implemented in an effort to further reduce the impacts of aircraft noise on the surrounding neighborhoods. The Fly Quiet Program is a voluntary program that encourages pilots and air traffic controllers to use designated nighttime preferential runways and flight tracks developed by the Chicago Department of Aviation (CDA) in cooperation with the O'Hare Noise Compatibility Commission, the airlines, and the air traffic controllers. These preferred routes direct aircraft over less-populated areas, such as forest preserves, highways, as well as commercial and industrial areas. As part of the Fly Quiet Program, the Chicago Department of Aviation prepares a Quarterly Fly Quiet Report. This report is shared with CDA staff, the O'Hare Noise Compatibility Commission, the airlines, the Federal Aviation Administration (FAA), and the general public. The Fly Quiet Report contains detailed information regarding Fly Quiet Mode, runway use, flight operations, flight tracks, and noise complaints and 24-hour tracking of ground run-ups. The data presented in this report is compiled from the Airport Noise Management System (ANMS) and airport operation logs. FLY QUIET MODE (FQM) The FAA considers nighttime hours as : p.m. - 7: a.m. It is the CDA s goal for the Fly Quiet Program to occur during the entire nine-hour nighttime period of : p.m. to 7: a.m., however due to operational demand by the airlines and traveling public, Fly Quiet is typically limited to a period less than nine hours. Fly Quiet Mode, the period of time in Fly Quiet, starts each night on or after : p.m., once demand allows for two departure runways and one arrival runway and allows for the use of the preferential flight tracks as outlined in the CDA s Fly Quiet Manual. Demand for the majority of the night allows for one arrival runway and one departure runway. Once demand increases in the morning where additional runways are needed and preferential flight tracks can no longer be utilized, Fly Quiet Mode stops. Highlights for 4Q 27 include: Average Start Time: :3 p.m. Average Stop Time: 5:44 a.m. Average Nightly Time in FQM: 7:3 Average Nightly Operations in FQM: 2 Airport Noise Compatibility Planning (4 CFR Part 5) Chicago Department of Aviation Page 4th Quarter 27

OPERATIONS O Hare has eight runways that are all utilized at different times depending on a number of conditions including weather, airfield pavement and construction activities, and air traffic demand. The Runway Use Reports disclose runway utilize for the period and compares the average percentage of use for each runway during the current quarter with the previous quarter as well as with the 2-month average. The percentage of use for departures and arrivals is shown graphically for each runway. This data is presented for all aircraft types during Fly Quiet Mode. The Nighttime Hourly Operations Report compares the arrivals and departures by hour in 5 minute increments to the current quarter with the previous quarter as well as with the 2-month average. Percentage is a ratio whereas a percentage point is the difference between two percentages. Highlights for 4Q 27 include: Departures Arrivals Most used nighttime departure runway: 28R 52% Most used nighttime arrival runway: 27L 4% 28R night departures increased by 2pp from 3Q 27 27L night arrivals increased by 2pp from 3Q 27 L night departures decreased by 8pp from 3Q 27 C night arrivals decreased 3pp from 3Q 27 pp = Percentage Points Nighttime operations represent % of the overall daily operations ARRIVAL SUMMARY A summary of nighttime arrivals is provided for the two most-used arrival runways (28C and C); the airline summary is also compared to the data from the same quarter of the previous year. PREFERENTIAL FLIGHT TRACKS As part of the Fly Quiet Program, the Chicago Department of Aviation worked with the O'Hare Noise Compatibility Commission, the airlines, and the air traffic controllers to identify preferred runways and flight tracks for nighttime operations at O Hare. The preferred routes direct aircraft over less-populated areas in an effort to limit the effects of noise on the surrounding communities. Adherence to nighttime departure preferential flight tracks is measured by the ANMS. A detailed airline deviation summary is provided for the two most-used departure runways (28R and L); the airline deviation is also compared to the data from the same quarter of the previous year. An average deviation graphic and table is provided for all runways. The Nighttime Departure Track Report measures FQM deviation (in nautical miles) from the preferred flight tracks and is divided into three categories: less than.5 miles; between.5 and. miles; and greater than. miles. Chicago Department of Aviation Page 2 4th Quarter 27

NOISE COMPLAINTS The Chicago Department of Aviation maintains a toll-free O Hare noise hotline (-8-435-9569) and an on line service at www.flychicago.com/ordnoise for citizens to express their concerns about particular incidents or about aircraft noise levels in general. The Nighttime Noise Complaint Report summarizes the number of complaints received and where the complainants were located. The tabular report lists the number of complaints by community as well as the number of individual complainants. The graph at the bottom of the page illustrates the nature of the complaints during the current quarter. Complaints include all complaints made within the State of Illinois to the O Hare Noise Hotline toll-free number or on line feature. GROUND RUN-UPS Ground run-ups are aircraft engine tests that are performed to ensure that the engines are working properly after maintenance is performed. Ground run-ups typically occur at night and generate high levels of noise for extended periods of time. In 997, the CDA constructed a ground run-up enclosure (GRE) at O Hare to help reduce the noise impacts of ground run-ups on the communities surrounding the airport. This facility was the first of its kind in the United States. When it is not possible to use the GRE, run-ups are performed on one of the three identified alternative locations. In the fall of 27, the CDA relocated the GRE from its original location to a new location approximately, feet to the northeast, but still located on the Scenic Hold Pad. The Airline Ground Run-up Report displays the total number of ground run ups from the current quarter by airline. The Aircraft Ground Run-up Report displays the total number of ground run ups from the current quarter by aircraft. Both reports compare the percent utilization of the GRE facility to the percent utilization of other locations for ground run-ups. It also compares the current quarter s GRE usage to the 2-month average and to the same quarter of the previous year. NOISE The Nighttime Aircraft Noise Report summarizes noise measurements from each of the 33 noise monitors located around O Hare. The data presented summarizes the Equivalent Sound Level (Leq). Leq is used to identify the average sound level over a given period of time (in this case p.m. to 7 a.m.) and is the metric used for this analysis as it is the most appropriate noise measure for periods of time less than 24 hours. The data in this report displays the average Leq for the current quarter and its comparison to the previous four quarters. It also compares the current quarter s Leq to the 2-month average. Numbers displayed in red represent an increase of at least db over the aircraft Leq from the same quarter of the previous year whereas numbers displayed in green represent a decrease of at least db from the aircraft Leq from the same quarter of the previous year. Chicago Department of Aviation Page 3 4th Quarter 27

Nighttime Hourly Operations Report Period: 4 th Quarter 27 Time of Day: : p.m. to 7: a.m. Average Arrivals and Departures by Hour 2 FQM START :3 PM FQM STOP 5:44 AM 5 Time In Fly Quiet Mode 7:3, 2 Operations Average Daily Operations 5 5 5 2 Nighttime Mode 9:, 24 Operations p.m. p.m. 2 a.m. a.m. 2 a.m. 3 a.m. 4 a.m. 5 a.m. 6 a.m. 4Q7 Arrivals 4Q6 Arrivals 4Q7 Departures 4Q6 Departures Chicago Department of Aviation Page 4 4th Quarter 27

Runway Use Report Period: 4 rd Quarter 27 Time of Day: : p.m. to 7: a.m. Runway Use ( p.m. to 7 a.m.) Source: Airport Noise Management System (ANMS) Runway Utilization 4L 4R 9L 9R L C R 5 22L 22R 27L 27R 28L 28C 28R 33 Average Daily Departures 4Q 27 9 4 4 5 7 3Q 27 6 2 2 2 23 5 39 4 2 Month Avg. 3 6 4 5 4 38 Average Daily Arrivals 4Q 27 5 6 6 2 57 9 34 2 n/a 3Q 27 6 9 3 8 39 2 3 33 9 35 7 n/a 2 Month Avg. 3 7 2 2 24 5 4 6 29 n/a 8% Departures ( p.m. to 7 a.m.) 8% Arrivals ( p.m. to 7 a.m.) 7% 7% 6% 6% 5% 5% 4% 4% 3% 3% 2% 2% % % % % Percentage Departure Utilization Percentage Arrival Utilization 4Q 27 # 4Q 27 3 7 8 4 52 9 4 9 4 24 5 # Chicago Department of Aviation Page 5 4th Quarter 27

Runway Use Report Period: 4 rd Quarter 27 Time of Day: Fly Quiet Mode (FQM) Runway Use (FQM) Source: Airport Noise Management System (ANMS) Runway Utilization 4L 4R 9L 9R L C R 5 22L 22R 27L 27R 28L 28C 28R 33 Average Daily Departures 4Q 27 2 4 2 3 2 4 3Q 27 6 7 7 2 6 4 6 n/a Average Daily Arrivals 4Q 27 6 6 2 25 2 n/a 3Q 27 6 7 7 2 6 4 6 n/a 8% Departures 8% Arrivals 7% 7% 6% 6% 5% 5% 4% 4% 3% 3% 2% 2% % % % % Percentage Departure Utilization Percentage Arrival Utilization 4Q 27 3 # 4Q 27 3 6 4 53 9 8 9 2 9 6 # Chicago Department of Aviation Page 6 4th Quarter 27

Nighttime Arrival Summary Period: 4 th Quarter 27 Time of Day: Fly Quiet Mode (FQM) Runway 27L Arrivals Airline Name Type 4 th Quarter 27 Arrivals 4 th Quarter 26 Arrivals AeroMexico P 59 Air Canada P 5 Air Canada Express/Sky Regional P 5 Alaska Airlines P 4 22 American Airlines P 555 23 American Eagle P 39 American Eagle/Envoy P 38 49 American Eagle/PSA Airlines P 2 Atlas Air C 2 Cargolux Airlines C Copa Airlines P 35 2 Delta Air Lines P 7 27 Delta Connection/Endeavor Air P 5 Emirates P 7 FedEx C 9 Frontier Airlines P 9 63 General Aviation 34 8 Interjet P 45 9 JetBlue Airways P 4 5 Kalitta Air C Kalitta Charters C Qatar Airways Company P 3 Republic Airlines P 2 5 Sky West Aviation P 22 39 Spirit Airlines P 26 86 United Airlines P 694 336 United Express/ASA P 5 9 United Express/Gojet P 7 8 United Express/Trans States P 2 UPS C 5 7 Virgin America P 5 29 Volaris P 23 2,36,62 Note : Passenger Carrier (P) or Dedicated Cargo (C) Carrier Category Percent of 4Q7 4Q6 United & American 65% 65% Other Domestic 23% 23% Other International 9% 8% Dedicated Cargo % 2% General Aviation 2% 2% % % Chicago Department of Aviation Page 7 4th Quarter 27

Nighttime Arrival Summary Period: 4 th Quarter 27 Time of Day: Fly Quiet Mode (FQM) Runway 28C Arrivals Airline Name Type 4 th Quarter 27 Arrivals 4 th Quarter 26 Arrivals AeroMexico P 32 33 AeroUnion C 6 Air Canada P 2 2 Air Canada Express/Sky Regional P 2 Air France P Air India P 8 AirBridge Cargo Airlines C 27 Alaska Airlines P 3 American Airlines P 93 9 American Eagle P 2 American Eagle/Envoy P Asiana Airlines P 8 7 Atlas Air C 5 22 Cargolux Airlines C 3 29 Cathay Pacific Airways P 5 3 China Airlines P 5 8 China Cargo Airlines C China Southern Airlines P 3 6 Copa Airlines P 4 Delta Air Lines P 34 7 Delta Connection/Endeavor Air P 2 2 Emirates P 7 Eva Airways P 3 FedEx C 94 7 Frontier Airlines P 3 42 General Aviation 29 Interjet P 2 5 jetblue Airways P 7 6 Kalitta Air C 2 7 Korean Air Lines P 2 29 Lufthansa P Lufthansa Cargo C 8 8 National Air Cargo C 4 Nippon Cargo Airlines C 7 6 Polar Air Cargo C 9 Qantas Airways P 5 4 Qatar Airways P 5 2 Republic Airlines P 3 6 Singapore Airlines Cargo C Sky Lease Cargo C 5 Sky West Aviation P 5 4 Spirit Airlines P 6 42 Turkish Airlines P 7 United Airlines P 283 224 United Express/ASA P 2 8 United Express/Gojet P 8 5 United Express/Trans States P 3 4 UPS C 52 6 Virgin America P 5 3 Volaris P 3 Yangtze River Express Airlines C 6,4 3 949 Note : Passenger Carrier (P) or Dedicated Cargo (C) Percent of Carrier Category 4Q7 4Q6 United & American 5% 4% Other Domestic 5% 4% Other International 3% 7% Dedicated Cargo 2% 26% General Aviation % 3% % % Chicago Department of Aviation Page 8 4th Quarter 27

Nighttime Preferential Flight Track Summary Period: 4 th Quarter 27 Time of Day: Fly Quiet Mode (FQM) Runway L Departures Airline 4 th Quarter 27 4 th Quarter 26 Name Type Departures Average Deviation (nautical miles) Departures Average Deviation (nautical miles) Aer Lingus P 2.7 Aerologic P 3.25 4.36 AeroMexico P 6.6 5.3 AeroUnion C 2.3 Air China Cargo C.5 4. Air France P.6 AirBridge Cargo Airlines C 8..3 American Airlines P 37.27.9 American Eagle/Envoy P 5.22 9.5 Asiana Airlines P 25.5 7.4 Atlas Air C 4.5 2.4 Cargolux Airlines C 7.33 6.3 Cathay Pacific Airways P 6.7 3.3 China Airlines P.3 China Cargo Airlines C 2.9 China Southern Airlines C.25 2.4 Delta Air Lines P 3.4. Emirates C.3. Eva Airways P 2.4 2.7 FedEx C 48.26 8. Interjet P 7.5 3.4 Kalitta Air C 2.2 2.22 Korean Air Lines P 8.3 4.5 LOT P 8.2 Lufthansa C 7.23 Lufthansa Cargo C 8. National Air Cargo C 3. 2.9 Nippon Cargo Airlines C.22 3.4 Qantas Airways P.2.4 Qatar Airways P 6.3 2. Republic Airlines P 5.7.2 Scandinavian Airlines P 5.26 Sky Lease Cargo C 2.2 Sky West Aviation P 4.36 Spirit Airlines P 5.2 2.9 Turkish Airlines P 4.38.6 United Airlines P 35.39 9.6 United Express/Gojet P 2.2 3. UPS C 3.9 7.7 Volaris P.6 Yangtze River Express Airlines C 2. 2.2 Overall 36.2 6.9 Green represents a deviation of less than.5 nautical miles Orange represents a deviation between.5 and. nautical miles Percent of Carrier Category Red represents a deviation greater than. nautical mile 4Q7 4Q6 Note : Passenger Carrier (P) or Dedicated Cargo (C) United & American 22% 29% Other Domestic 7% 4% Other International 3% 27% Dedicated Cargo 4% 4% General Aviation % % % % Chicago Department of Aviation Page 9 4th Quarter 27

Nighttime Preferential Flight Track Summary Period: 4 th Quarter 27 Time of Day: Fly Quiet Mode (FQM) Runway 28R Departures Airline 4 th Quarter 27 4 th Quarter 26 Name Type Departures Average Deviation (nautical miles) Departures Average Deviation (nautical miles) Aer Lingus P 2.49 Aerologic C 4.4 8.35 AeroMexico P 76.3 26.7 AeroUnion C. Air Canada P 3.2.33 Air France P 8.26 2.6 AirBridge Cargo Airlines C 3.56 4.4 Alaska Airlines P 2.27.8 American Airlines P 23.29 57.3 American Eagle/Envoy P 3.9 83.6 Asiana Airlines P 77.3 4.37 Atlas Air C 26.29.8 British Airways P 2.43 2.45 Cargolux Airlines C 42.38.43 Cathay Pacific Airways P 29.37.26 China Airlines C 4..36 China Cargo Airlines C 2.58.2 China Southern Airlines C 6.36.4 Delta Air Lines P. 3.9 DHL/Airborne Express C 2.26 Emirates P 5.37 8.4 Eva Airways P 5.53 9.47 FedEx C 28.2 3.22 Finnair P 5.29 2.4 Frontier Airlines P 6.2 9.32 General Aviation 2.4.32 jetblue Airways P 5.2 Kalitta Air C 37.4 4.37 Korean Air Lines P 47.35.26 LOT P 9.55 5.4 Lufthansa P 2.26 3.47 Lufthansa Cargo C 4.3 4.25 National Air Cargo C 7.36. Nippon Cargo Airlines C 44.32 6.29 Polar Air Cargo C.35.4 Qantas Airways P 2.48 4.55 Qatar Airways P 24.4 9.33 Republic Airlines P 34.2 26.2 Royal Jordanian P 4.46 3.4 Scandinavian Airlines P 2.35 9.38 Singapore Airlines Cargo C 7.2 Sky West Aviation P 42.9 3.5 Spirit Airlines P 47.29 2.8 Turkish Airlines P.42 3.35 United Airlines P 83.24 4.33 United Express/ASA P 5.9 2.22 United Express/Gojet P 23.9 5.8 United Express/Trans States P 3.24 6.2 UPS C 92.5 32.5 Western Global Airlines C 4.3 Yangtze River Express Airlines C 3.35 4.24 Overall,688.3 674.3 Green represents a deviation of less than.5 nautical miles Orange represents a deviation between.5 and. nautical miles Percent of Red represents a deviation greater than. nautical mile Carrier Category 4Q7 4Q6 Note : Passenger Carrier (P) or Dedicated Cargo (C) United & American 33% 43% Other Domestic 5% 3% Other International 24% 23% Dedicated Cargo 28% 2% General Aviation % % % % Chicago Department of Aviation Page 4th Quarter 27

Nighttime Departure Track Report Period: 4 th Quarter 27 Time of Day: : p.m. to 7: a.m. 3,552 FQM Departures 5,3 Non-FQM 2 Departures 8,852 Departures Preferential Flight Track Existing Runways to be Decommissioned Existing Runways Future Runways Deviation (# tracks) <.5 (2,872).5 <. (256) >. (59) Runway Departures (in %) versus Deviation (in nautical miles) 4L 4R 9L 9R C L R 5 22L 22R 27L 27R 28C 28L 28R 33 93% n/a n/a 92% 9% n/a n/a 44% n/a 84% n/a n/a 93% 99% 2% n/a n/a 6% n/a 7% n/a n/a 48% n/a 3% n/a n/a n/a 6% % 5% n/a n/a 2% 2% n/a n/a 8% n/a 3% n/a n/a % % n/a = not applicable Note : Departures from runways C and 28C are shown in white and do not have preferential flight tracks. Note 2: Non-FQM departures are shown in blue. Flight tracks shown until 3,' Mean Sea Level (MSL). Chicago Department of Aviation Page 4th Quarter 27

Nighttime Noise Complaint Report Period: 4 th Quarter 27 Time of Day: : p.m. to 7: a.m. Complaints by Community Nature of Noise Complaints Community Complaints Number of Complainants Addison 2 Arlington Heights,3 5 Barrington Bartlett 652 2 Batavia Bensenville 82,85 5 Berkeley 4 4 Bloomingdale 744 58 Chicago 6,446 2,949 Ward 38,9 25 Ward 39 4,62 55 Ward 4 83 6 Ward 4 8,668 63 Ward 45 5,953 48Not Reported Ward Other 8,43 5 % Ward Unknown 2,592 2,592 Deer Park Des Plaines 386 2 Downers Grove 23 Elgin 78 5 Elk Grove Village 8,669 4,424 Elmhurst,287 57 Elmwood Park 4 2 Evanston 657 6 Frankfort Franklin Park 3 7 Geneva 7,634 7,632 Gilberts 328 Glen Ellyn 8 Glencoe Glenview,768 47 Hanover Park 337 3 Harwood Heights 279 9 Hillside 9 Itasca 2,98 4 Kirkland 2 2 La Grange Park Lincolnwood 3,837 3 Lombard 3 3 Medinah 822 9 Morton Grove Mount Prospect 3 Niles 2,27 6 Norridge,98 2 Northbrook 42 3 Northfield 9 3 Palatine 25 5 Park Ridge 75,683 6,773 Prospect Heights 2 River Forest 5 5 Roselle 5 5 Rosemont 2 Schaumburg 9,373 8,688 Schiller Park,257 Skokie 598 2 South Barrington 2 6 Unincorporated Cook 95 Vernon Hills Villa Park 49 2 Wayne 34 3 West Dundee 62 2 Western Springs 53 Wheaton 24 3 Wilmette 74 Winfield 6 2 Wood Dale 2,947 4,428 Community Unknown 2 2 4Q 27 389,546 7,589 3Q 27 443,622 5,8 2 Month Average 2 379,29 25,358 Only includes calls made from the State of Illinois. 2 2 Month Average equals average of: Q 27, 2Q 27, 3Q 27 and 4Q 27. Low Flying 5% Aircraft Noise 37% Frequency of Operations 2% Vibration % Chicago Department of Aviation Page 2 4th Quarter 27

Chicago Department of Aviation Page 3 4th Quarter 27

Nighttime Aircraft Noise Report Period: 4 th Quarter 27 Time of Day: : p.m. to 7: a.m. Metric: Aircraft Leq RMT # Community Last 4 Quarters Monitored Noise Levels Q 27 2Q 27 3Q 27 4Q 27 4Q 26 2 Month Avg. Arlington Heights 46.6 49.4 45.4 49.4 48. 48. 2 Melrose Park 43.2 5.4 5.5 47.9 48.7 49.2 3 Bensenville 53.8 54.7 54.6 55.5 56.4 54.7 4 Schiller Park 45.3 47.8 47.7 48.3 5.7 47.4 5 Chicago 5.7 53.9 58. 52.3 5.5 54.7 7 Des Plaines 38. 4.4 4.6 4.4 39.3 4.6 8 Des Plaines 42.2 5.4 53.6 49. 46.4 5.3 Rolling Meadows 45. 49. 46.8 45. 5.5 46.8 Chicago 44.2 46.8 48.3 44. 45. 46.2 2 Elk Grove Village 5.9 53.3 49. 5.7 5.8 5.3 3 Elk Grove Village 57.4 58.8 57.2 55.7 59. 57.4 4 Elk Grove Village 5.4 5.4 46.2 49.3 52. 5. 5 Franklin Park 39.4 42. 4.8 39.7 45.3 4.9 6 Franklin Park 52.3 54.8 55.7 55.8 56.5 54.8 7 Harwood Heights 56.8 57.2 58.4 58. 57. 57.7 9 Stone Park 4.9 4.8 4. 42.4 4.3 4.4 2 Mount Prospect 44.6 45.6 42.7 45.4 45. 44.7 2 Mount Prospect 37.2 4.7 38.9 39.9 42.6 39.7 22 Norridge 6.6 59.8 62.3 59.4 57.6 6.7 23 Northlake 52. 54.7 56.7 54.5 55. 54.8 24 Park Ridge 4.7 46.5 47. 43.7 43.2 45.3 25 Park Ridge 53.6 54.5 54.3 53.3 53.2 54. 26 Park Ridge 45.9 48.6 47.2 47. 44.9 47.3 27 Rosemont 6.4 6.2 6.7 6. 6.8 6.6 28 Schiller Park 67.6 68.3 67.6 68. 66.8 67.9 29 Wood Dale 59. 6.2 6. 58.2 58.3 59.4 3 Wood Dale 46.7 46.7 46.2 48. 46.8 47. 32 Wood Dale 57.4 57.9 6. 6.4 57.8 59.5 33 Park Ridge 47.9 52.4 52.6 52.2 49.9 5.7 34 Elk Grove Village 49.5 5.2 5. 5.7 5.5 5.7 35 Unincorporated Cook 45. 48.5 48. 48.4 49. 47.7 37 Mount Prospect 37. 36.7 37.7 36.8 38.2 37. 42 Chicago 44.7 49. 48.9 48.5 46. 48. Leq (Equivalent Sound Level): The average sound energy level during a stated period of time. Red represents an increase of db or more from same quarter of the previous year (3 monitors). Green represents a decrease of db or more from same quarter of the previous year (9 monitors). Chicago Department of Aviation Page 4 4th Quarter 27

Airline Ground Run-Up Report Period: 4th Quarter 27 Time of Day: 24 Hours All Airlines Other Location GRE Other GRE Other GRE Other GRE Other GRE Other GRE Other 4th Quarter 27 3rd Quarter 27 Run-ups Percentage 59 9% 245 8% 34 % 2 25% 64 75% 85 % 4% 62 86% 72 % 8 2% 69 79% 87 % 5 6% 26 84% 3 % 5 7% 24 83% 29 % Run-ups Percentage 38 45% 69 55% 37 % 34 36% 6 64% 95 % 2 44% 25 56% 45 % 6 6% 38 39% 98 % 4 34% 27 66% 4 % 36% 8 64% 28 % 2 Month Avg. Run-ups Percentage 38 5% 3 49% 269 % 45 53% 39 47% 84 % 27 55% 22 45% 49 % 4 58% 29 42% 69 % 7 37% 28 63% 45 % 9 4% 3 6% 22 % Ground Run-Up Locations 4Q 27 GRE 9% Other 8% 2 Month Average equals the average of: Q 27, 2Q 27, 3Q 27 and 4Q 27. Note: GRE was out of service for relocation from August 4, 27 through December 4, 27. Chicago Department of Aviation Page 5 4th Quarter 27

Aircraft Ground Run-Up Report Period: 4 th Quarter 27 Time of Day: 24 Hours 4 th Quarter 27 3 rd Quarter 27 Aircraft Run-ups Run-ups in GRE Percentage Use of GRE Run-ups Run-ups in GRE Percentage Use of GRE A39 3 2 67% 3 3 % A32 2 2 7% 3 8 62% B737 63 4 22% 68 26 38% B747 % 3 % B757 9 % 7 6% B767 7 4% 9 % B777 % 3 % B787 2 % 2 % CRJ2/7 67 6 24% 83 57 69% DC9Q % % E35/45 4 4 2% 79 3 39% MD8 22 7 32% 25 2 48% Other 3 2 67% % TOTAL 34 59 9% 37 38 75% Note: GRE was out of service for relocation from August 4, 27 through December 4, 27. Chicago Department of Aviation Page 6 4th Quarter 27

Chicago Department of Aviation O Hare Noise Hotline: -8-435-9569 www.flychicago.com/ordnoise