Backtaxi (also known as backtrack) is an airport ground procedure which involves the use of any portion of a runway as a taxiway for an aircraft to taxi in the opposite direction from which it will take off or has landed.
[1][2] The procedure is commonly used at smaller airports and private strips which may not have separate paved taxiways parallel to the runway.
It is a higher-risk procedure, as pilots may not see, or hear the radio transmissions from, aircraft taxiing on the runway.
[4][5] At uncontrolled airports, pilots are recommended to broadcast their intentions while backtracking in the interest of safety; for example, the statement "Entering and backtracking runway 36" would indicate the aircraft is taxiing along a magnetic heading of 180 degrees, against the flow of traffic.
[6] The ramps and taxiways were occupied by numerous parked aircraft which had been detoured as a result of a bomb threat at another airport.