I have issues of wingmen ejecting nearly every mission, even though I try to save their fuel (going slow after take-off so they can catch up, etc.).
It seems that when we change directions they take forever to react (even when the turn is their way), use the airbrake and then catch-up with afterburner.
So far that is the main issue I have with the campaign, too bad because apart from that it is truly immersive.