If I may interject. It's easy to set a delay time for a flight. Just change the Start time of the first waypoint.
As far as planes spawning but not taking off, this can be done with a little 'trickery'. Veteran mission builders know all these tricks. I've also been able to make AI planes spawn on the runway, start their engines, sit there for a designated time and then take off. This is done with a lot of imagination and sometimes many hours of testing.
Aviar
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