Originally Posted by
able
When you arrive at the gate you will notice that ground personnel have been taught to open the cargo doors instantly. This stops the aircraft clock and you have "arrived".
That shouldn't make any difference. The time recorded is the time that the parking brake was set. That time is transmitted until a door opens. This is done because the parking brake can be set multiple times during the taxi in if the flight has to wait for other traffic or their gate. ACARS always knows the last time that the brake was set and will make that time the official IN time once a door is opened.