Fly Quiet Program · American Airlines 268 69 Asiana Airlines 8 5 Atlas Air 2 29 Cargolux Airlines 17 7 Cathay Pacific Airways 3 3 China Airlines 5 2 China Cargo Airlines 4 1 China

Visit the O’Hare Noise Webpage on the Internet at www.flychicago.com/ORDNoise

4th Quarter 2015 Report

Fly Quiet Program Chicago O’Hare International Airport

4th Quarter 2015 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 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 Chicago Department of Aviation officials, the O'Hare Noise Compatibility Commission, the airlines, and the general public. The Fly Quiet Report contains detailed information regarding nighttime 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. 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 Nighttime Runway Use Report 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 nighttime hours of 10:00 p.m. to 7:00 a.m. The Nighttime Hourly Operations Report compares the arrivals and departures by hour 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 4Q 2015 include:

Departures Arrivals Most used nighttime departure runway: 28R – 31% Most used nighttime arrival runway: 28C – 27% 10L night departures increased by 7pp from 3Q 2015 28R night arrivals increased by 11pp from 3Q 2015 22L night departures decreased by 5pp from 3Q 2015 28C night arrivals decreased by 9pp from 3Q 2015

pp = Percentage Points Nighttime operations represent 11% of the overall daily operations

Arrival Summary A summary of nighttime arrivals is provided for the two most-used arrival runways (28C and 27L); 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

Chicago Department of Aviation Page 1 4th Quarter 2015

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 32L); 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 Flight Track Report measures 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 greater than 1.0 miles

Noise Complaints The Chicago Department of Aviation maintains a toll-free O’Hare noise hotline (1-800-435-9569) 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 1997, the Chicago Department of Aviation 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. 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. Aircraft 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 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.


Runway Use ReportChicago O'Hare International AirportPeriod: 4th Quarter 2015Time of Day: 10:00 p.m. to 7:00 a.m.

Purple denotes Fly Quiet preferential departure and arrival runways.

Runway 10R-28L was commissioned on October 15, 2015.

0

5

22

018

27

00

7

1

2

4

00

0

9

0

10

1

017

31

0

0

30

0

0%

10%

20%

30%

40%

50%

60%

70%

80%

Runway Use (10 p.m. to 7 a.m.) Source: Airport Noise Management System (ANMS)

4L 4R 9L 9R 10L 10C 10R 14L 14R 22L 22R 27L 27R 28L 28C 28R 32L 32R

Average Daily Departures4Q 2015 0 0 0 9 10 1 0 n/a 0 18 0 0 0 0 3 33 32 n/a3Q 2015 1 0 0 6 4 2 0 0 0 27 0 0 0 0 6 37 34 312 Month Avg. 1 0 0 11 8 2 0 0 0 20 0 0 0 0 5 41 21 2

Average Daily Arrivals4Q 2015 0 0 6 1 10 19 1 n/a 3 0 1 31 6 0 38 25 n/a n/a3Q 2015 0 1 4 4 6 19 0 0 1 0 0 45 9 0 56 11 n/a 012 Month Avg. 0 1 4 3 9 18 0 0 3 0 0 46 7 0 37 13 n/a 0

Runway Utilization

0%

10%

20%

30%

40%

50%

60%

70%

80%

4Q 20154Q 2015

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

Percentage Departure Utilization Percentage Arrival Utilization

0

2

0

0

13

0 0 1 0


Nighttime Hourly Operations ReportChicago O'Hare International AirportPeriod: 4th Quarter 2015Time of Day: 10:00 p.m. to 7:00 a.m.

4Q 2015 10 p.m. 11 p.m 12 a.m. 1 a.m. 2 a.m. 3 a.m. 4 a.m. 5 a.m. 6 a.m. TotalDepartures 39.8% 10.0% 5.5% 3.5% 2.5% 1.2% 1.0% 7.8% 28.7% 100%Arrivals 14.7% 11.9% 4.5% 1.9% 1.1% 1.7% 8.5% 15.6% 40.1% 100%

* 12 Month Average equals the average of 1Q 2015, 2Q 2015, 3Q 2015 and 4Q 2015.

Operations by Hour (%)

21 17

6

3 1 2

12

22

57

22 17

7

3 1 2

9

28

54

0

10

20

30

40

50

60

70

10 p.m. 11 p.m. 12 a.m. 1 a.m. 2 a.m. 3 a.m. 4 a.m. 5 a.m. 6 a.m.

Ave

rage

Arr

ival

s

Hour

Average Arrivals by Hour

4Q15 3Q15 12 Month Average*

43

11

6 4 3 1 1

8

31

44

15

6 3 2 2 1

6

41

10

20

30

40

50

60

70

10 p.m. 11 p.m. 12 a.m. 1 a.m. 2 a.m. 3 a.m. 4 a.m. 5 a.m. 6 a.m.

Ave

rage

Dep

artu

res

Hour

Average Departures by Hour

4Q15 3Q15 12 Month Average*


Nighttime Arrival SummaryChicago O'Hare International AirportPeriod: 4th Quarter 2015Time of Day: 11:00 p.m. to 6:00 a.m.

4th Quarter 2015 4th Quarter 2014

Airline

AeroMexico 27 15

AeroUnion 2 1Air China Cargo 6 4Air India 4 14AirBridge Cargo Airlines 7 4Alaska Airlines 14 8American Airlines 268 69Asiana Airlines 8 5Atlas Air 2 29Cargolux Airlines 17 7Cathay Pacific Airways 3 3China Airlines 5 2China Cargo Airlines 4 1China Southern Airlines 1 --Copa Airlines 9 3Delta Air Lines 6 1Delta Connection 1 --DHL/Airborne Express 19 --Eastern Airlines 1 --Emirates 5 1Envoy Air 259 47FedEx 74 100Frontier Airlines 26 4JetBlue Airways 1 4Kalitta Air 1 2Korean Air Lines 4 7Lufthansa Cargo 5 2Martinair 4 --National Air Cargo 2 2Netjets 2 1Nippon Cargo Airlines 2 1Polar Air Cargo 3 3Qantas Airways 3 2Qatar Airways 9 30Republic Airlines 45 --Scandinavian Airlines 1 --Sky Lease Cargo 1 --Sky West Aviation 46 29Spirit Airlines 61 25Swift Air 3 3TNT Airways 6 --United Airlines 261 121United Express/ASA 30 34United Express/Gojet 14 15United Express/Shuttle America 13 25United Express/Trans States 10 19UPS 54 60Virgin America 13 4XOJet 1 --Yangtze River Express Airlines 1 1

Total 1,364 693

Runway 28C ArrivalsArrivals Arrivals


Nighttime Arrival SummaryChicago O'Hare International AirportPeriod: 4th Quarter 2015Time of Day: 11:00 p.m. to 6:00 a.m.

4th Quarter 2015 4th Quarter 2014

AirlineAeroMexico 33 148AeroUnion 1 --Air Choice One 1 3Alaska Airlines 21 63American Airlines 186 423American Eagle/Air Wisconsin 1 --Asiana Airlines 1 --Atlas Air 1 27

Aviacsa 1 --Copa Airlines 12 39Delta Air Lines 8 8Delta Connection 1 5DHL/Airborne Express 5 --Envoy Air 139 286Frontier Airlines 33 63JetBlue Airways 4 32Korean Air Lines 1 --Lufthansa Cargo 1 1Netjets 1 4Qatar Airways 1 2Republic Airlines 16 63Sky West Aviation 36 154Spirit Airlines 75 230Swift Air 4 16TNT Airways 1 --United Airlines 267 817United Express/ASA 33 185United Express/Gojet 17 80United Express/Shuttle America 10 54United Express/Trans States 8 89UPS 2 21Virgin America 17 54Worldwide Jet 1 --

Total 939 2,867

Runway 27L ArrivalsArrivals Arrivals


Nighttime Preferential Flight Track SummaryChicago O'Hare International AirportPeriod: 4th Quarter 2015Time of Day: 11:00 p.m. to 6:00 a.m.

Airline

Aerologic 8 0.38 3 0.19

AeroMexico 56 0.17 133 0.19AeroUnion 3 0.13 8 0.18Air China Cargo 21 0.34 39 0.37Air Choice One 1 1.59 4 1.11Air France 1 0.30 7 0.35AirBridge Cargo Airlines 18 0.46 33 0.55Alaska Airlines 1 0.48 1 0.34American Airlines 117 0.27 107 0.42Asiana Airlines 41 0.35 49 0.17Atlas Air 2 0.69 33 0.23Cargolux Airlines 34 0.26 28 0.36Cathay Pacific Airways 14 0.21 55 0.49China Cargo Airlines 14 0.29 10 0.36Delta Air Lines 8 0.27 17 0.21DHL/Airborne Express 5 0.42 -- --Emirates 20 0.38 9 0.45Envoy Air 16 0.33 173 0.36Eva Airways 3 0.17 3 0.33FedEx 30 0.29 140 0.31Frontier Airlines 3 0.19 3 0.30JetBlue Airways 3 0.12 13 0.26Kalitta Air 3 0.47 4 0.21Korean Air Lines 42 0.20 70 0.23LOT 3 0.31 3 0.68Lufthansa 1 0.09 1 0.30Lufthansa Cargo 17 0.35 8 0.41National Air Cargo Group 2 0.12 1 0.06Nippon Cargo Airlines 32 0.32 50 0.41Polar Air Cargo 5 0.12 -- --Qantas Airways 9 0.57 2 0.22Qatar Airways 12 0.39 4 0.37Republic Airlines 1 0.05 125 0.33Royal Jordanian Airlines 3 0.34 1 0.86Scandinavian Airlines 8 0.31 1 0.52Singapore Airlines Cargo 1 0.01 -- --Sky West Aviation 4 1.01 59 0.38Spirit Airlines 42 0.34 40 0.25Swift Air 3 0.22 9 0.16TNT Airways 11 0.25 -- --Turkish Airlines 4 0.34 4 0.39United Air Lines 83 0.38 82 0.34United Express/ASA 7 0.30 71 0.33United Express/Gojet 11 0.27 -- --United Express/Shuttle America 5 0.13 67 0.20United Express/Trans States 2 0.36 32 0.24UPS 30 0.21 65 0.15Yangtze River Express Airlines 2 0.48 8 0.17

Overall 762 0.33 1,575 0.34Green represents a deviation of less than 0.5 nautical miles

Orange represents a deviation between 0.5 and 1.0 nautical miles

Red represents a deviation greater than 1.0 nautical mile

Runway 28R Departures4th Quarter 20144th Quarter 2015

DeparturesAverage

Deviation (nautical miles)

DeparturesAverage



Nighttime Preferential Flight Track SummaryChicago O'Hare International AirportPeriod: 4th Quarter 2015Time of Day: 11:00 p.m. to 6:00 a.m.

AirlineAer Lingus 3 0.04 -- --

Aerologic 2 0.44 1 0.22

AeroMexico 42 0.16 5 0.22

AeroUnion 1 0.16 -- --

Air Canada 1 0.54 -- --

Air China Cargo 3 0.12 -- --

Air France 3 0.11 1 0.07

Air Nunavut 1 0.09 -- --

AirBridge Cargo Airlines 10 0.28 -- --

Alaska Airlines 2 0.59 -- --

America West Airlines 1 0.15 2 0.11

American Airlines 143 0.27 3 0.10

Asiana Airlines 15 0.14 -- --

Atlas Air 9 0.19 1 0.14

British Airways 1 0.30 -- --

Cargolux Airlines 13 0.30 4 0.14

Cathay Pacific Airways 6 0.36 1 0.01

China Cargo Airlines 12 0.25 -- --

Delta Air Lines 9 0.40 -- --

DHL/Airborne Express 21 0.21 -- --

Eastern Airlines 1 0.23 -- --

Emirates 10 0.16 -- --

Envoy Air 79 0.30 1 0.11

FedEx 107 0.20 4 0.06

Frontier Airlines 13 0.17 -- --

JetBlue Airways 2 1.15 -- --

Kalitta Air 4 0.29 2 0.11

Korean Air Lines 15 0.14 -- --

Landmark Aviation 1 0.04 -- --

LOT 1 0.32 1 0.10

Lufthansa 2 0.07 -- --

Lufthansa Cargo 10 0.13 1 0.10

National Air Cargo 2 0.27 -- --

Netjets 3 0.14 -- --

Nippon Cargo Airlines 27 0.15 -- --

Qantas Airways 1 0.09 -- --

Qatar Airways Company 4 0.22 1 0.00

Republic Airlines 19 0.41 -- --

Royal Jordanian 1 0.09 -- --

Scandinavian Airlines 4 0.37 -- --

Singapore Airlines Cargo 1 0.27 -- --

Sky Lease Cargo 1 0.21 -- --

Sky Regional Airlines 1 0.69 -- --

Sky West Aviation 47 0.21 -- --

Spirit Airlines 33 0.16 2 0.14

Swift Air 2 0.10 -- --

TNT Airways 3 0.02 -- --

Turkish Airlines 3 0.49 -- --

Ultimate Air Shuttle 2 0.13 -- --

United Airlines 191 0.27 6 0.17

United Express/ASA 43 0.13 5 0.05

United Express/Gojet 50 0.27 2 0.12

United Express/Shuttle America 28 0.23 5 0.12

United Express/Trans States 8 0.15 -- --

UPS 43 0.16 3 0.04

WestJet Airlines 1 0.22 -- --

Yangtze River Express Airlines 1 0.01 -- --

Overall 1,062 0.24 12 0.73Green represents a deviation of less than 0.5 nautical miles

Orange represents a deviation between 0.5 and 1.0 nautical miles

Red represents a deviation greater than 1.0 nautical mile

Runway 32L Departures4th Quarter 20144th Quarter 2015

DeparturesAverage


DeparturesAverage



Nighttime Flight Track ReportChicago O'Hare International AirportPeriod: 4th Quarter 2015Time of Day: 11:00 p.m. to 6:00 a.m.

Deviation 4L 4R 9L 9R 10C 10L 10R 14R 22L 22R 27L 27R 28C 28L 28R

< 0.5 n/a n/a n/a 91% n/a 84% n/a 71% 48% n/a 81% n/a n/a n/a 79%

0.5 < 1.0 n/a n/a n/a 4% n/a 9% n/a 0% 44% n/a 6% n/a n/a n/a 19%

>1.0 n/a n/a n/a 5% n/a 7% n/a 29% 8% n/a 13% n/a n/a n/a 2%

n/a = not applicableFlight tracks shown until 3,000' Mean Sea Level (MSL)

Runway Departures (in %) versus Deviation (in nautical miles)

Preferential Flight Track Existing Runwaysto be Decommissioned

Existing Runways Future Runways


Nighttime Noise Complaint ReportChicago O'Hare International AirportPeriod: 4th Quarter 2015Time of Day: 10:00 p.m. to 7:00 a.m.

CommunityTotal

ComplaintsNumber of

Complainants

Addison 40 9Arlington Heights 2,430 18Barrington Hills 2 1Bartlett 10 3Bensenville 73,921 120Berkeley 1 1Bloomingdale 1,329 35Buffalo Grove 1 1Carol Stream 4 3Chicago 85,432 16,344

Ward 38 7,105 114Ward 39 15,077 224Ward 40 4,096 79Ward 41 17,428 369Ward 45 7,391 496Ward Other 15,841 188Ward Unknown 18,418 14,874

Chicago Ridge 9 2Des Plaines 52 11Elgin 213 9Elk Grove Village 10,969 6,126Elmhurst 306 15Evanston 1 1Forest Park 1 1Frankfort 14 2Franklin Park 56 2Glen Ellyn 973 4Glendale Heights 1 1Glenview 18 8Hanover Park 5 2Harvard 49 2Harwood Heights 1,194 85Hillside 17 9Inverness 2 2Itasca 11,843 96Kenilworth 4 1Lake Zurich 2 2Lincolnwood 1,198 136Medinah 530 8Mount Prospect 1,209 15Niles 1,253 13Norridge 3,319 223Northbrook 25 5Northlake 13 1Oak Park 1 1Palatine 2 1Park Ridge 7,172 162River Forest 982 982River Grove 3 1Riverside 14 3Rolling Meadows 1 1Roscoe 7 1Roselle 547 11Rosemont 3 3Saint Charles 7 6Schaumburg 3,828 3,205Schiller Park 4,049 53Skokie 5 3St. Charles 4 2Wayne 1,594 4Wellington 67 1West Chicago 471 7Wheaton 207 4Wood Dale 11,410 4,758Community Unknown 17,673 3,738

4Q 2015 Total 244,493 36,2643Q 2015 Total 270,483 33,84212 Month Average2 219,815 26,7251 Only includes calls made from the State of Illinois. 2 12 Month Average equals average of: 1Q 2015, 2Q 2015, 3Q 2015 and 4Q 2015.

Complaints by Community1 Nature of Noise Complaints

Low Flying24%

Frequency of Operations

19%Vibration6%

Aircraft Noise51%

Not Reported0%


Airline Ground Run-Up ReportChicago O'Hare International AirportPeriod: 4th Quarter 2015Time of Day: 24 Hours

All AirlinesLocation Run-ups Percentage Run-ups Percentage Run-ups PercentageGRE 132 80% 140 78% 146 72%Other 33 20% 39 22% 56 28%Total 165 100% 179 100% 202 100%GRE 80 80% 78 74% 62 71%Other 20 20% 27 26% 25 29%Total 100 100% 105 100% 87 100%GRE 17 100% 17 100% 18 100%Other 0 0% 0 0% 0 0%Total 17 100% 17 100% 18 100%GRE 20 100% 19 100% 30 100%Other 0 0% 0 0% 0 0%Total 20 100% 19 100% 30 100%GRE 12 50% 16 57% 13 33%Other 12 50% 12 43% 28 67%Total 24 100% 28 100% 41 100%GRE 3 75% 10 100% 10 89%

Other Other 1 25% 0 0% 1 11%Total 4 100% 10 100% 11 100%

112 Month Average equals the average of: 1Q 2015, 2Q 2015, 3Q 2015 and 4Q 2015.

4th Quarter 2015 3rd Quarter 2015 12 Month Avg. 1

Ground Run-Up Locations4Q 2015

GRE80%

Other20%


Aircraft Ground Run-Up ReportChicago O'Hare International AirportPeriod: 4th Quarter 2015Time of Day: 24 Hours

Aircraft Run-ups Total

Run-ups in GRE

Percentage Use of GRE

Run-ups Total

Run-ups in GRE

Percentage Use of GRE

A319 1 1 100% 2 2 100%

A320 4 2 50% 9 8 89%

B737 59 53 90% 42 40 95%

B747 5 0 0% 3 0 0%

B757 1 0 0% 3 1 33%

B767 14 1 7% 25 2 8%

B777 6 1 17% 7 0 0%

DC9Q 0 0 0% 0 0 0%

E135/145 18 18 100% 15 15 100%

MD80 32 32 100% 42 42 100%

Regional Jet (unspecified type) 23 23 100% 30 30 100%

Other 2 1 50% 1 0 0%

TOTAL 165 132 80% 179 140 78%

4th Quarter 2015 3rd Quarter 2015



Nighttime Aircraft Noise ReportChicago O'Hare International AirportPeriod: 4th Quarter 2015Time of Day: 10:00 p.m. to 7:00 a.m.Metric: Aircraft Leq

1Q 2015 2Q 2015 3Q 2015 4Q 2015

1 Arlington Heights 45.9 47.4 49.6 49.2 44.6 48.32 Melrose Park 42.2 46.9 48.1 50.1 40.0 47.63 Bensenville 54.6 55.8 53.9 54.2 56.1 54.74 Schiller Park 42.2 47.2 -- 48.5 42.0 43.45 Chicago 52.1 53.3 51.1 51.7 52.9 52.17 Des Plaines 41.4 42.5 41.3 42.2 43.1 41.98 Des Plaines 44.9 49.6 45.8 44.8 42.8 46.810 Rolling Meadows 44.3 44.8 44.7 44.2 42.1 44.511 Chicago 43.1 45.9 42.9 44.4 42.3 44.312 Elk Grove Village 51.4 53.0 48.7 52.1 51.4 51.613 Elk Grove Village 56.6 58.0 61.4 61.1 53.2 59.714 Elk Grove Village 49.0 52.2 53.5 54.5 47.3 52.715 Franklin Park 40.1 42.3 38.2 41.5 39.5 40.816 Franklin Park 55.3 56.5 54.8 56.0 56.1 55.717 Harwood Heights 55.3 55.8 57.0 59.6 56.7 57.219 Stone Park 40.8 42.4 41.8 42.1 40.7 41.820 Mount Prospect 44.7 46.2 47.7 47.9 44.5 46.821 Mount Prospect 38.1 39.2 41.3 43.5 38.3 41.022 Norridge -- -- 58.4 60.8 57.7 56.823 Northlake 54.6 56.0 57.2 55.4 55.5 55.924 Park Ridge 39.5 43.9 39.5 43.2 39.6 42.025 Park Ridge 51.3 54.4 50.6 52.5 52.1 52.426 Park Ridge 42.5 46.8 42.6 46.5 43.5 45.127 Rosemont 57.1 60.3 56.1 59.7 58.2 58.628 Schiller Park 66.8 66.4 64.9 66.6 67.8 66.229 Wood Dale 56.9 60.1 58.4 58.4 57.0 58.630 Wood Dale 42.4 44.1 44.4 44.0 45.2 43.832 Wood Dale 58.8 59.4 58.6 58.6 60.9 58.933 Park Ridge 48.1 51.8 50.6 51.1 49.7 50.634 Elk Grove Village 49.2 51.5 49.6 50.7 51.4 50.435 Unincorporated Cook 47.4 48.9 48.5 50.1 48.8 48.837 Mount Prospect 35.6 37.4 37.4 38.1 35.6 37.242 Chicago -- -- 45.5 46.9 -- n/a

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 (21 monitors). Green represents a decrease of 1 dB or more from same quarter of the previous year (5 monitors).

4Q 2014 12 Month Avg.RMT # Community

Last 4 Quarters Monitored Noise Levels 1


Chicago Department of Aviation O’Hare Noise Hotline: 1-800-435-9569

www.flychicago.com/ORDNoise

Documents

Fly Quiet Program · American Airlines 268 69 Asiana Airlines 8 5 Atlas Air 2 29 Cargolux Airlines 17 7 Cathay Pacific Airways 3 3 China Airlines 5 2 China Cargo Airlines 4 1 China