On June 17, 1997, the City of Chicago announced that airlines operating at Chicago O'Hare International Airport (O'Hare) had agreed to use designated noise abatement flight procedures in accordance with the Fly Quiet Program. This program was implemented to reduce the impacts of aircraft noise on neighborhoods surrounding O'Hare. 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 (ONCC), the airlines, and the air traffic controllers. These preferred routes are intended to direct aircraft over less-populated areas, such as forest preserves and highways, as well as commercial and industrial areas.
As part of the Fly Quiet Program, the CDA prepares a Fly Quiet Report. This report is shared with CDA officials, the ONCC, 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.