In mission 4 I start in the shelter, then after start up ask tower for clearance to taxi.
"Negative."
I've been sitting in my cockpit for 20 minutes, still the tower won't let me get to war. And if I tell the tower guy to screw himself and start off anyway my flight of course stays put in their bunkers...
As much as I love the sim, the campaigns so far have been a rather anticlimactic experience.
EDIT: The takeoff problem screws up the whole mission. Even if you decide to take off alone, your CAP (2xF-15s) will keep sitting on the airfield, while another pair of F-15s land. And 3 Mig-29s are inbound for you.
Not fun.