Welcome to the forum!
Agree! It’s a bit strange that planes arrive and have 4 hours before departure and are still delayed. In real life, especially short haul flights, planes only have 30 to 40 mins between arrival and departure. Long haul, depending on the size of the plane, is between 2 and 4 hours.
There are numerous ideas around this (this is a good thread to follow), on the forum and the devs are also working on a new path finding system, so hopefully in the future we can assign personnel/vehicles to stands, determine work schedules, etc. and will PAX/personnel/vehicles be on or ahead of time for departure/work.
Hope you enjoy the game, it’s already great but much more to come!