1st Quarter 2018 Report

Fly Quiet Program O’Hare International Airport

Visit the O’Hare Noise Webpage on the Internet at www.flychicago.com/ORDNoise 1st Quarter 2018 Report

BACKGROUND

On June 17, 1997, 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 10:00 p.m. - 7:00 a.m.1 It is the CDA’s goal for the Fly Quiet Program to occur during the entire nine-hour nighttime period of 10:00 p.m. to 7:00 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 10:00 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 1Q 2018 include:

Average Start Time: 10:36 p.m. Average Stop Time: 5:47 a.m. Average Nightly Time in FQM: 7:11 Average Nightly Operations in FQM: 94

1 Airport Noise Compatibility Planning (14 CFR Part 150)

Chicago Department of Aviation Page 1 1st Quarter 2018 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 12-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 15 minute increments to the current quarter with the previous quarter as well as with the 12-month average. Percentage is a ratio whereas a percentage point is the difference between two percentages.

Highlights for 1Q 2018 include:

Departures Arrivals Most used nighttime departure runway: 28R – 49% Most used nighttime arrival runway: 27L – 38% 9R night departures increased by 7pp from 4Q 2017 10C night arrivals increased by 10pp from 4Q 2017 32L night departures decreased by 5pp from 4Q 2017 28R night arrivals decreased 4pp from 4Q 2017 pp = Percentage Points Nighttime operations represent 10% of the overall daily operations

ARRIVAL SUMMARY

A summary of nighttime arrivals is provided for the two most-used arrival runways (27L and 10C); 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 10L); 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 0.5 miles;  between 0.5 and 1.0 miles; and  greater than 1.0 miles.

Chicago Department of Aviation Page 2 1st Quarter 2018 NOISE COMPLAINTS

The Chicago Department of Aviation maintains a toll-free O’Hare noise hotline (1-800-435-9569) and an online 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 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 online service.

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 1997, 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 . 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 2017, the CDA relocated the GRE from its original location to a new location approximately 1,100 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 12-month average and to the same quarter of the previous year.

NOISE

The Nighttime Aircraft Noise Report summarizes noise measurements from each of the 35 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 10 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 12-month average. Numbers displayed in red represent an increase of at least 1 dB over the aircraft Leq from the same quarter of the previous year whereas numbers displayed in green represent a decrease of at least 1 dB from the aircraft Leq from the same quarter of the previous year.

Chicago Department of Aviation Page 3 1st Quarter 2018 Runway Use Report Chicago O'Hare International Airport Period: 1st Quarter 2018 Time of Day: 10:00 p.m. to 7:00 a.m.

Runway Use (10 p.m. to 7 a.m.) Source: Airport Noise Management System (ANMS) Runway Utilization 4L 4R 9L 9R 10L 10C 10R 15 22L 22R 27L 27R 28L 28C 28R 33 Average Daily Departures 1Q 2018 0 0 0 14 11 2 0 0 11 0 0 0 0 5 43 2 4Q 2017 1 0 0 10 9 1 0 0 14 0 0 0 0 4 50 7 12 Month Avg. 3 0 0 16 14 2 0 0 16 0 0 0 0 4 41 6 Average Daily Arrivals 1Q 2018 0 0 7 1 7 28 1 0 0 0 51 6 0 28 7 n/a 4Q 2017 0 1 5 1 6 16 1 0 0 2 57 9 0 34 12 n/a 12 Month Avg. 0 3 7 2 10 27 1 0 1 4 44 7 0 30 10 n/a

Departures (10 p.m. to 7 a.m.) Arrivals (10 p.m. to 7 a.m.) 80% 80%

70% 70%

60% 60%

50% 50%

40% 40%

30% 30%

20% 20%

10% 10%

0% 0%

Percentage Departure Utilization Percentage Arrival Utilization 1Q 2018 1Q 2018 0 0 # 0

0 0 5 4

3 0

0 17 1 38

0 0 5 49 12 5 21 5 2 21 0 0 0 0 # 0 0 0 12 0 0

Chicago Department of Aviation Page 4 1st Quarter 2018 Runway Use Report Chicago O'Hare International Airport Period: 1st Quarter 2018 Time of Day: Fly Quiet Mode (FQM)

Runway Use (FQM) Source: Airport Noise Management System (ANMS) Runway Utilization 4L 4R 9L 9R 10L 10C 10R 15 22L 22R 27L 27R 28L 28C 28R 33 Average Daily Departures 1Q 2018 0 0 0 3 6 2 0 0 1 0 0 0 0 4 18 1 4Q 2017 0 1 0 0 6 6 0 0 0 2 25 0 0 12 11 n/a Average Daily Arrivals 1Q 2018 0 0 0 0 6 15 0 0 0 0 23 0 0 9 6 n/a 4Q 2017 0 1 0 0 6 6 0 0 0 2 25 0 0 12 11 n/a

Departures Arrivals 80% 80%

70% 70%

60% 60%

50% 50%

40% 40%

30% 30%

20% 20%

10% 10%

0% 0%

Percentage Departure Utilization Percentage Arrival Utilization 1Q 2018 1Q 2018 0 0 # 0

0 0 0 0

3 0

1 10 0 39

0 0 11 51 17 10

11 4 25 15 0 0 0 0 # 0 0 0 3 0 0

Purple denotes Fly Quiet preferential departure and arrival runways.

Chicago Department of Aviation Page 5 1st Quarter 2018 Nighttime Arrival Summary Chicago O'Hare International Airport Period: 1st Quarter 2018 Time of Day: Fly Quiet Mode (FQM)

Runway 27L Arrivals 1st Quarter 2018 1st Quarter 20172 Airline Arrivals Arrivals Name Type1

AeroMexico P 81 54 P 2 3 Air Canada Express/Sky Regional P 4 1 P 40 35 P 478 237 American Eagle P 56 -- American Eagle/Envoy P 57 59 American Eagle/PSA Airlines P 3 1 C 1 2 P 34 15 P 48 43 Delta Connection/Endeavor Air P 3 1 P 12 -- FedEx C 5 4 Frontier Airlines P 115 76 General Aviation -- 21 42 P 1 -- P 49 30 JetBlue Airways P 40 26 Kalitta Air C 1 -- Airways C 1 -- Company P 7 1 Republic Airlines P 28 32 Sky West Aviation P 145 224 Spirit Airlines P 218 84 P 544 295 United Express/ASA P 10 102 United Express/Gojet P 23 22 United Express/Trans States P 19 11 UPS C 3 7 Virgin America P 3 16 P 23 7 Total 2,075 1,430 Note 1: Passenger Carrier (P) or Dedicated Cargo (C) Note 2: From 11:00 p.m. to 6:00 a.m. Percent of Total Carrier Category 1Q18 1Q17 United & American 65% 69% Other Domestic 23% 20% Other International 10% 7% Dedicated Cargo 1% 1% General Aviation 1% 3%

Total 100% 100%

Chicago Department of Aviation Page 6 1st Quarter 2018 Nighttime Arrival Summary Chicago O'Hare International Airport Period: 1st Quarter 2018 Time of Day: Fly Quiet Mode (FQM)

Runway 10C Arrivals 1st Quarter 2018 1st Quarter 20172 Airline Arrivals Arrivals Name Type1

Aerologic C 4 -- AeroMexico P 40 19 Air Canada P 3 -- P 5 4 AirBridge Cargo Airlines C 7 5 Alaska Airlines P 22 13 American Airlines P 252 98 American Eagle P 22 -- American Eagle/Envoy P 41 23 American Eagle/PSA Airlines P 2 1 P 14 1 Atlas Air C 6 9 Airlines C 10 8 Airways P 3 2 C 1 2 C 1 -- C 2 3 Copa Airlines P 20 6 Delta Air Lines P 47 9 Delta Connection/Endeavor Air P 2 -- Emirates P 10 2 Eva Airways P 2 -- FedEx C 42 27 Frontier Airlines P 48 24 General Aviation -- 14 8 Interjet P 34 9 jetBlue Airways P 17 7 Kalitta Air C 10 -- Lines P 18 7 LOT P 1 -- Cargo C 5 3 C 3 1 Polar Air Cargo C 2 2 Qantas Airways P 2 -- Qatar Airways P 13 2 Republic Airlines P 12 17 Silk Way Airlines C 2 -- Airlines Cargo C 1 -- Sky West Aviation P 49 51 Spirit Airlines P 140 29 P 4 1 United Airlines P 343 127 United Express/ASA P 7 26 United Express/Gojet P 17 4 United Express/Trans States P 16 9 UPS C 22 22 Volaris P 12 -- Western Global Airlines C 7 -- Total 1,357 581 Note 1: Passenger Carrier (P) or Dedicated Cargo (C) Note 2: From 11:00 p.m. to 6:00 a.m. Percent of Total Carrier Category 1Q18 1Q17 United & American 53% 61% Other Domestic 18% 14% Other International 18% 9% Dedicated Cargo 7% 14% General Aviation 4% 2%

Total 100% 100%

Chicago Department of Aviation Page 7 1st Quarter 2018 Nighttime Preferential Flight Track Summary Chicago O'Hare International Airport Period: 1st Quarter 2018 Time of Day: Fly Quiet Mode (FQM)

Runway 10L Departures

1st Quarter 2018 1st Quarter 20172 Airline

Average Average Name Type1 Departures Deviation Departures Deviation (nautical miles) (nautical miles) Aerologic P 5 0.17 2 0.03 AeroMexico P 26 0.25 26 0.22 AirBridge Cargo Airlines C 13 0.23 9 0.39 American Airlines P 50 0.22 38 0.47 American Eagle P 10 0.18 -- -- American Eagle/Envoy P 4 0.25 3 0.23 Asiana Airlines P 31 0.23 36 0.16 Atlas Air C 6 0.22 10 0.29 P 2 0.12 1 0.02 Cargolux Airlines C 15 0.15 17 0.37 Cathay Pacific Airways P 8 0.24 11 0.27 China Airlines C 4 0.16 1 0.20 China Southern Airlines C 1 0.12 1 0.00 Delta Air Lines P 2 0.22 1 0.07 Emirates P 3 0.20 9 0.13 Eva Airways P 17 0.14 11 0.31 FedEx C 58 0.27 55 0.24 Frontier Airlines P 2 0.08 1 0.20 General Aviation -- 2 0.12 3 0.13 Interjet P 23 0.25 15 0.26 Jetblue Airways P 1 0.01 -- -- Kalitta Air C 16 0.23 4 0.22 Korean Air Lines P 13 0.17 12 0.20 LOT P 12 0.23 5 0.11 Lufthansa P 10 0.12 5 0.28 C 9 0.41 6 0.12 Nippon Cargo Airlines C 18 0.19 12 0.22 Polar Air Cargo C 1 0.38 -- -- Qantas Airways P 4 1.11 6 0.19 Qatar Airways P 6 0.12 3 0.17 Republic Airlines P 1 0.04 1 0.13 P 14 0.21 3 0.16 Cargo C 1 0.09 10 0.45 Sky West Aviation P 16 0.18 7 0.41 Spirit Airlines P 6 0.33 11 0.15 Turkish Airlines P 13 0.23 3 0.15 United Airlines P 17 0.17 22 0.32 United Express/ASA P 2 0.24 4 0.20 United Express/Gojet P 2 0.18 -- -- United Express/Trans States P 1 0.09 4 0.22 UPS C 36 0.31 11 0.20 Volaris P 2 0.14 -- -- Western Global Airlines C 4 0.24 -- -- Yangtze River Express Airlines C 3 0.17 -- -- Overall 490 0.21 379 0.21 Green represents a deviation of less than 0.5 nautical miles Orange represents a deviation between 0.5 and 1.0 nautical miles Percent of Total Carrier Category Red represents a deviation greater than 1.0 nautical mile 1Q18 1Q17 Note 1: Passenger Carrier (P) or Dedicated Cargo (C) United & American 21% 21% Note 2: From 11:00 p.m. to 6:00 a.m. Other Domestic 2% 3% Other International 38% 39% Dedicated Cargo 39% 36% General Aviation 0% 1%

Total 100% 100%

Chicago Department of Aviation Page 8 1st Quarter 2018 Nighttime Preferential Flight Track Summary Chicago O'Hare International Airport Period: 1st Quarter 2018 Time of Day: Fly Quiet Mode (FQM)

Runway 28R Departures 1st Quarter 2018 1st Quarter 20172 Airline

Average Average Name Type1 Departures Deviation Departures Deviation (nautical miles) (nautical miles) P 1 0.35 -- -- Aerologic C 9 0.40 9 0.53 AeroMexico P 67 0.36 64 0.28 AeroUnion C 1 0.24 3 0.21 Air Canada P 3 0.19 1 0.15 Air Canada Express/Sky Regional P 1 1.25 -- -- P 5 0.45 3 0.34 AirBridge Cargo Airlines C 16 0.60 25 0.57 Alaska Airlines P 6 0.38 1 0.92 American Airlines P 228 0.38 150 0.33 American Eagle/Envoy P 34 0.51 8 0.29 Asiana Airlines P 67 0.30 77 0.37 Atlas Air C 16 0.33 34 0.23 Cargolux Airlines C 26 0.52 28 0.50 Cathay Pacific Airways P 13 0.56 15 0.47 China Airlines C 3 0.36 4 0.43 China Cargo Airlines C 5 0.29 4 0.52 China Southern Airlines C 7 0.47 1 0.45 Delta Air Lines P 7 0.17 16 0.16 Emirates P 13 0.56 19 0.43 Eva Airways P 37 0.55 40 0.50 FedEx C 118 0.33 52 0.23 Frontier Airlines P 5 0.35 2 0.12 General Aviation -- 4 0.03 3 0.46 jetBlue Airways P 3 1.11 3 0.25 Kalitta Air C 35 0.14 -- -- Korean Air Lines P 29 0.27 30 0.34 LOT P 2 0.87 3 0.45 Lufthansa P 2 0.54 4 0.38 Lufthansa Cargo C 16 0.35 5 0.44 National Air Cargo C 1 0.00 1 0.72 Nippon Cargo Airlines C 24 0.31 16 0.37 Qantas Airways P 9 0.32 7 0.55 Qatar Airways P 22 0.47 18 0.56 Republic Airlines P 7 0.74 15 0.13 P 1 0.52 -- -- Scandinavian Airlines P 6 0.52 4 0.53 Singapore Airlines Cargo C 1 0.32 -- -- Sky West Aviation P 88 0.37 34 0.18 Spirit Airlines P 79 0.31 81 0.29 Turkish Airlines P 6 0.59 2 0.33 United Airlines P 66 0.44 65 0.31 United Express/ASA P 10 0.77 8 0.18 United Express/Gojet P 18 0.31 3 0.14 United Express/Trans States P 15 0.71 12 0.26 UPS C 28 0.21 15 0.14 Yangtze River Express Airlines C 3 0.32 3 0.33 Overall 1,163 0.43 888 0.37 Green represents a deviation of less than 0.5 nautical miles Orange represents a deviation between 0.5 and 1.0 nautical miles Percent of Total Carrier Category Red represents a deviation greater than 1.0 nautical mile 1Q18 1Q17 Note 1: Passenger Carrier (P) or Dedicated Cargo (C) United & American 40% 33% Note 2: From 11:00 p.m. to 6:00 a.m. Other Domestic 9% 12% Other International 24% 32% Dedicated Cargo 27% 23% General Aviation 0% 0%

Total 100% 100%

Chicago Department of Aviation Page 9 1st Quarter 2018 Nighttime Departure Track Report Chicago O'Hare International Airport Period: 1st Quarter 2018 Time of Day: 10:00 p.m. to 7:00 a.m.

3,090 FQM Departures 4,787 Non-FQM2 Departures 7,877 Total Departures

Preferential Flight Existing Runways Existing Runways Future Runways Track to be Decommissioned Runway Departures (in %) versus Deviation (in nautical miles) Deviation 4L 4R 9L 9R 10C 10L 10R 15 22L 22R 27L 27R 28C 28L 28R 33 (# tracks) < 0.5 100% 100% n/a 93% 95% n/a 100% 45% n/a 90% n/a n/a 91% 100% (2,371) 0.5 < 1.0 0% 0% n/a 4% n/a1 4% n/a 0% 45% n/a 5% n/a n/a1 n/a 8% 0% (198) >1.0 0% 0% n/a 3% 1% n/a 0% 10% n/a 5% n/a n/a 1% 0% (43) n/a = not applicable Note 1: Runways 10C and 28C are shown in white and do not have preferential flight tracks. Note 2: Non-FQM departures are shown in purple. Flight tracks shown until 3,000' Above Ground Level (AGL). Chicago Department of Aviation Page 10 1st Quarter 2018 Nighttime Noise Complaint Report Chicago O'Hare International Airport Period: 1st Quarter 2018 Time of Day: 10:00 p.m. to 7:00 a.m.

Complaints by Community1 Nature of Noise Complaints

Total Number of Community Complaints Complainants

Addison 91 Arlington Heights 593 4 Bartlett 50 3 Bensenville 19,046 15 Low Flying Berkeley 33 31% Not Reported Bloomingdale 36 5 1% Burlington 11 Carol Stream 11 Frequency of Chicago 18,553 7,200 Operations Ward 38 647 26 2% Ward 39 2,191 44 Vibration Ward 40 261 10 2% Ward 41 3,902 280 Ward 45 1,896 36 Ward Other 2,885 37 Ward Unknown 6,771 6,767 Des Plaines 241 9 Downers Grove 59 2 Elgin 73 Elk Grove Village 4,749 2,153 Aircraft Noise Elmhurst 39 15 64% Evanston 505 1 Franklin Park 13 6 Geneva 1,423 1,420 Gilberts 217 1 Glen Ellyn 91 Glenview 230 16 Hanover Park 366 3 Harwood Heights 66 5 Hillside 81 Inverness 21 Itasca 1,522 8 Lincolnwood 835 3 Medinah 691 7 Mount Prospect 53 Niles 432 3 Norridge 433 16 Northlake 22 Palatine 54 Park Ridge 16,893 14,289 River Forest 53 53 River Grove 41 Rolling Meadows 52 Roselle 13 5 Rosemont 21 Schaumburg 446 349 Schiller Park 425 11 Skokie 76 2 South Barrington 53 St. Charles 21 Unincorporated Cook 343 2 Wayne 28 3 West Chicago 41 2 West Dundee 21 Western Springs 61 Wheaton 21 Winfield 54 10 Wood Dale 5,341 3,731 Community Unknown 55

1Q 2018 Total 73,897 29,389 4Q 2017 Total 389,546 117,589 12 Month Average2 341,491 111,667 1 Only includes calls made from the State of Illinois. 2 12 Month Average equals average of: 2Q 2017, 3Q 2017, 4Q 2017 and 1Q 2018.

Chicago Department of Aviation Page 11 1st Quarter 2018 Chicago Department of Aviation Page 12 1st Quarter 2018 Nighttime Aircraft Noise Report Chicago O'Hare International Airport Period: 1st Quarter 2018 Time of Day: 10:00 p.m. to 7:00 a.m. Metric: Aircraft Leq

1 RMT Last 4 Quarters Monitored Noise Levels Community 1Q 2017 12 Month Avg. # 2Q 2017 3Q 2017 4Q 2017 1Q 2018

1 Arlington Heights 49.4 45.4 49.4 50.9 46.6 49.2 2 Melrose Park 50.4 51.5 47.9 47.7 43.2 49.7 3 Bensenville 54.7 54.6 55.5 56.6 53.8 55.4 4 Schiller Park 47.8 47.7 48.3 46.6 45.3 47.6 5 Chicago 53.9 58.0 52.3 51.6 51.7 54.7 7 Des Plaines 40.4 41.6 41.4 39.1 38.1 40.8 8 Des Plaines 50.4 53.6 49.0 45.5 42.2 50.5 10 Rolling Meadows 49.0 46.8 45.1 38.1 45.0 46.2 11 Chicago 46.8 48.3 44.0 44.8 44.2 46.3 12 Elk Grove Village 53.3 49.1 50.7 50.5 50.9 51.2 13 Elk Grove Village 58.8 57.2 55.7 54.1 57.4 56.8 14 Elk Grove Village 51.4 46.2 49.3 47.5 51.4 49.1 15 Franklin Park 42.1 41.8 39.7 40.0 39.4 41.0 16 Franklin Park 54.8 55.7 55.8 54.2 52.3 55.2 17 Harwood Heights 57.2 58.4 58.1 55.2 56.8 57.4 18 Norridge ------51.3 -- -- 19 Stone Park 41.8 40.0 42.4 41.8 40.9 41.6 20 Mount Prospect 45.6 42.7 45.4 47.1 44.6 45.5 21 Mount Prospect 41.7 38.9 39.9 40.0 37.2 40.2 22 Norridge 59.8 62.3 59.4 58.0 60.6 60.2 23 Northlake 54.7 56.7 54.5 53.4 52.0 55.0 24 Park Ridge 46.5 47.1 43.7 41.9 41.7 45.3 25 Park Ridge 54.5 54.3 53.3 53.0 53.6 53.8 26 Park Ridge 48.6 47.2 47.1 45.9 45.9 47.3 27 Rosemont 61.2 60.7 60.0 60.3 60.4 60.6 28 Schiller Park 68.3 67.6 68.1 66.8 67.6 67.8 29 Wood Dale 60.2 60.0 58.2 58.6 59.0 59.4 30 Wood Dale 46.7 46.2 48.0 44.7 46.7 46.6 32 Wood Dale 57.9 60.0 61.4 57.4 57.4 59.5 33 Park Ridge 52.4 52.6 52.2 50.4 47.9 52.0 34 Elk Grove Village 51.2 50.0 51.7 49.4 49.5 50.7 35 Unincorporated Cook 48.5 48.0 48.4 46.2 45.1 47.9 37 Mount Prospect 36.7 37.7 36.8 38.1 37.0 37.4 42 Chicago 49.1 48.9 48.5 48.3 44.7 48.7 44 Itasca ------57.8 -- -- 1 Leq (Equivalent Sound Level): The average sound energy level during a stated period of time. Red represents an increase of 1 dB or more from same quarter of the previous year (14 monitors). Green represents a decrease of 1 dB or more from same quarter of the previous year (6 monitors).

Chicago Department of Aviation Page 13 1st Quarter 2018 Airline Ground Run-Up Report Chicago O'Hare International Airport Period: 1st Quarter 2018 Time of Day: 24 Hours

All Airlines 1st Quarter 2018 4th Quarter 2017 12 Month Avg. 1 Location Run-ups Percentage Run-ups Percentage Run-ups Percentage GRE 216 86% 59 19% 152 54% Other 35 14% 245 81% 129 46% Total 251 100% 304 100% 281 100% GRE 70 85% 21 25% 46 54% Other 12 15% 64 75% 39 46% Total 82 100% 85 100% 85 100% GRE 40 98% 10 14% 26 54% Other 1 2% 62 86% 22 46% Total 41 100% 72 100% 48 100% GRE 80 98% 18 21% 56 66% Other 2 2% 69 79% 29 34% Total 82 100% 87 100% 85 100% GRE 21 51% 5 16% 17 39% Other 20 49% 26 84% 27 61% Total 41 100% 31 100% 44 100% GRE 5 100% 5 17% 7 37% Other Other 0 0% 24 83% 12 63% Total 5 100% 29 100% 19 100%

Ground Run-Up Locations 1Q 2018 Other 14%

GRE 86%

112 Month Average equals the average of: 2Q 2017, 3Q 2017, 4Q 2017 and 1Q 2018 . Note: GRE was out of service for relocation from August 14, 2017 through December 14, 2017.

Chicago Department of Aviation Page 14 1st Quarter 2018 Aircraft Ground Run-Up Report Chicago O'Hare International Airport Period: 1st Quarter 2018 Time of Day: 24 Hours

1st Quarter 2018 4th Quarter 2017

Run-ups Run-ups Percentage Run-ups Run-ups Percentage Aircraft Total in GRE Use of GRE Total in GRE Use of GRE

A319 5 4 80% 3267%

A320 10 8 80% 12 2 17%

B737 88 75 85% 63 14 22%

B747 0 0 0% 100%

B757 15 4 27% 9111%

B767 4 0 0% 7114%

B777 2 1 50% 100%

B787 0 0 0% 200%

CRJ200/700 57 55 96% 67 16 24%

DC9Q 0 0 0% 000%

E135/145 66 65 98% 114 14 12%

MD80 3 3 100% 22 7 32%

Other 1 1 100% 3267%

TOTAL 251 216 86% 304 59 19%

Note: GRE was out of service for relocation from August 14, 2017 through December 14, 2017.

Chicago Department of Aviation Page 15 1st Quarter 2018

Chicago Department of Aviation O’Hare Noise Hotline: 1-800-435-9569 www.flychicago.com/ORDNoise