Jan. 1995-Sept. 2008
Taxi-out and taxi-in times for domestic scheduled flights operated by airlines reporting on-time data. Airlines that meet the revenue threshold or report voluntarily. Taxi-out is time from gate departure to wheels-off the runway. Taxi-in is time from wheels-on the runway to gate arrival. BTS received numbers for flights that traveled directly to destination and were not canceled or diverted.
Oct. 2008-Aug. 22, 2011
Airlines reporting on-time data also reported data on canceled and diverted flight tarmac times.
Apr. 29, 2010
DOT enforcement rule became effective, making airlines subject to fines for tarmac times of more than 3 hours
Aug. 23, 2011
BTS began receiving reports from all airlines serving the U.S. on tarmac times of more than three hours on any flight, scheduled service or charter, domestic or foreign, at a U.S. airport. International flights became subject to enforcement for tarmac times of more than four hours.