Fly Quiet

O’Hare International Airport introduced the first Ground Run-Up Enclosure (GRE) in the United States in 1997 at a cost of $3.2 million.

Today, O’Hare is one of only 10 airports to provide a GRE where airlines routinely inspect and maintain aircraft to ensure safety of the traveling public and to meet stringent maintenance schedules.

Aircraft engine run-ups operate at high power on the ground for several minutes and generally occur at night when aircraft are finished flying for the day. The GRE structure uses acoustical dampening principles to reduce the impact of maintenance noise.

GRE Fact Sheet