Originally Posted by hamster3null
We already know that the aircraft missed its regular check-in at 23:41 UTC and only got through at 00:11.
The timing of the AES interrogation is set by the GES software; dependent on packet traffic.
In other words, the GES polls the AES.
Originally Posted by TerryB
My guess from what has been stated in other posts and my experience with computer systems is that the aircraft sent a login type message to the satellite to say "I'm active" (presumably after some type of reset which we are guessing may be due to a power off/on event).
That is valid following any short-term power outage or loss of the GES P channel signal.