i think that there is no fix for that at this moment
(so just have to take off from carrier now)
*alert intercept xp bug solved*!
If some of the missions feel too easy this may be the reason -> alert intercept aircraft will not take off.
On my system alert intercept will work ONLY if i put one waypoint to alert plane(s) and insert message action. Empty message is just fine.
So i just have to edit and fix these missions.
again: sorry the bad english