Aircraft Fleet Mix Report

Operations for all Hours of the Day

The Aircraft Fleet Mix Report summarizes the number and type of aircraft operating at O’Hare International Airport during both all hours of the day and during the nighttime hours.

In 1990, Congress enacted legislation to eliminate all State 2 aircraft operating in the continental United States by the year 2000. In response, the FAA created a program to “phase-out” the older, louder Stage 2 aircraft over a ten-year period to achieve full compliance by the 2000 deadline. As of January 2000, all aircraft operating at O’Hare and within the United States were Stage 3. Stage 3 aircraft, such as the Boeing 757 (B757) and new Boeing 737’s (B737) use a quieter type of engine that significantly reduces noise at the source. Also, a Stage 3 aircraft can be a previous Stage 2 aircraft with the engines retrofitted with a “Hush-kit” such as a Boeing 727 (B72Q), Boeing 737-200 (B73Q) and DC-9 (DC9Q). More than 98% of the operations at O’Hare International Airport are originally certified as Stage 3 aircraft.