Definition of "Arrival time"
I'm looking for any reference on the web to the ICAO (I believe; might be IATA but I doubt it) for what constitutes the proper definition of scheduled departure and arrival. I saw it once, years ago.
I do believe it is either chocks off/chocks on, or door closed/door open; whatever it is, something that is measured at the stand.
Carriers still seem to look at departures by stand time, but an increasing number seem to be comparing their scheduled arrival to, of all things, touchdown time, which is of course well short of anything happening on the stand.
Door open would certainly pick up those instances of stopping on stand and then waiting around for a steps or jetway operator.
If someone can point out the official line I would be grateful.