Planes get "stuck" and refuse to fly

[Anzatax]

Unk? I suspect that the server maintainence periods may be the culprit behind the unscheduled flights. Do flights still schedule during the maintainence timeframe? Because it seems that the problems always occurs with the same flights, so maybe they are rescheduled at the same time as the server maintainence, which means that they are not scheduled at all time after time again. Plus this problem seems to have appeared after the server maintainence times were extended.

I don't really understand how the server and codes work, so I may be wrong