thank you for your response..

1) can you show any screenshots or manual copy to let me know where in ICAO documents it talks about these scheduled and actual times.

This will help me for reference.


2) the FIDS (by Civil Aviation Dept) use the terminology

- ATA for touchdown and
- Chocks On (or On Blocks) for the time at Gate.

So, why would the airline call the time at the gate ATA - Actual Time of Arrival?? instead of Chocks On...

Which is official terminology..

- FIDS's Use of ATA for touchdown or
- Airline's use of ATA for time at Gate.


Please explain

thanks.