The total time from the moment an aircraft first moves under its own power for the purpose of taking off until the moment it comes to rest at the end of the flight.
ICAO, Official definition modified by Amdt 20 to An 6/I (10/11/1994), Amdt 15 to An 6/II (10/11/1994), and by Amdt 2 to An 6/III (10/11/1994). Note 2 to the above official definition was added to An 1 by Amdt 161 (5/11/1998), and it also appears in An 6/III.
Note 1.— Flight time as here defined is synonymous with the term 'block-to-block' time or 'chock to chock' time in general usage which is measured from the time an aircraft moves from the loading point until it stops at the unloading point.
Note 2.— Whenever helicopter rotors are engaged, the time will be included in the flight time. (An 1, An 6/I, An 6/II, An 6/III)