ICAO Doc 4444
Chapter 1. Definitions
Estimated time of arrival. For IFR flights, the time at which it is estimated that the aircraft will arrive over that designated point, defined by reference to navigation aids, from which it is intended that an instrument approach procedure will be commenced, or, if no navigation aid is associated with the aerodrome, the time at which the aircraft will arrive over the aerodrome. For VFR flights, the time at which it is estimated that the aircraft will arrive over the aerodrome.
- ETA. Estimated Time of Arrival, estimated time A/C will fly over IAF (for IFR flights) and arrive over the destination airport (for VFR flights).
- EAT. Expected Approach Time, the time at which ATC expects that an arriving aircraft, following a delay, will leave the holding fix.
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