I don't know. I feel that a plane would be kind of boring. I mean, yeah, it'd be neat to see, but it wouldn't take much time to see all that it has to offer. at least with ship wrecks, they're huge! so when your dives are at 100+ ft on the wreck, they only last about 25 minutes (avg breathing.0) You can dive a ship wreck a bunch of times before you see it all. plus, the amount of sea life that a sunken ship hosts is unbelievable.
i don't think you'd really have any of this with a plane. drop down, swim around it, explore the debris field, and done. it'd be done in a dive or two. you can dive a ship for days before you see all that it has to offer.
I haven't dove any 747's or anything like that, but this has been my experience with other small planes that i've seen. but even a 747 pales in comparison to the size of an aircraft carrier. ship wrecks ftw!