I know I'm necro'ing this thread quite a bit, but I prefer using an older thread to creating one.
I like this idea, airplanes were a part of the cinematic Guns of Icarus Online Trailer and it would be cool to invoke that Crimson Skies feel to Online play.
Granted, this type of thing is extremely different compared to other ships and weapons, and balancing it correctly is a ton of work, but it's just a cool thing to suggest.
Not sure about the helicopter, though. I feel like airplanes are niche enough for Online.
The biggest concern is how to coordinate teamwork with it, it seems like it would be easy for the Gunner to just run off and do their own thing while the Carrier sits back. Well...then the rest of the crew just twiddles their thumbs in waiting.
All in all, it's a complicated thing to work on, but I would like to see it sometime. I know it'll most likely show up on Adventure Mode, but Online Play would be interesting to have it.