It would likely have to be a very small part of the game. A large high flying stealth bomber would require your ship to fly very high, and be stealthy. This essentially means going through the nice open air without obstacles or enemies. This is pretty boring by itself, and shouldn't be a large part of any mission. Then you have to drop your payload, giving away your presence. At this point it's either mission complete (boring) or you need to fend off some ships as you make your escape.
Let's say it's large and slow moving. It would essentially turn into a turret game where players run to different guns to shoot the smaller ships that are attacking them (Original Guns of Icarus). Maybe it has some small ships of it's own that it releases and some dog-fighting ensues? That would have to be a whole new mechanic, but it is adventure mode, so that wouldn't be too much of a problem. Maybe. And then that's it I guess. Maybe you'd have other team ships on the outskirts that would have to rush to your rescue, or even enemy ships that would come in to destroy you. Kind of like a 'protect the king' type of gameplay. This would be pretty interesting.
However, to me at least, the stealth part seems fairly boring. Just floating through the sky. Maybe try to dodge some spotlights in the night?