The Federal Aviation Administration (FAA) defines en route delays as delays of 15 minutes or more during the length of the flight, after the aircraft has been pushed back from the gate. More specifically, a delay (of 15 minutes or more) incurred on a taxiway, on a runway, en route, or in the airspace holding pattern, is considered an en route delay.
Read More Here: What Are The Primary Causes Of En Route Delays For US Flights | SimpleFlying.com
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