I've seen plenty of fighters at 30K. Most of them, however, are mission-based fighter sweeps and HQ raids. (Not to mention the random fighter jockey who pointed a Ta-152 skyward to see how far it'd go.) But, this may also add an entire new element to fighter missions. See, skilled mission planners may recognize the small/med darbar deep inside enemy territory as a climbing B-29 formation (side note- it may be a good idea to add a darbar multiplier to B-29's to balance them out a bit) and quickly organize a high-altitude interceptor mission. With a large interceptor mission likely to take off as soon as the B-29's broke the dar floor, long range fighter escort would be necessary. Personally, I believe that this could potentially introduce a whole new dimension to gameplay.
However, I also believe that the B-29 is last on the list of things we need. Even though this could be good for the game, I'd rather see the Ohka put in before the B-29. (Mostly because putting in the Ohka would establish the framework for introducing landing transports with vehicles, but it's still an all-around bad idea.) Also, the B-29 would need a heavy perk price to prevent it being abused, but that goes without saying.
Also, WE WILL NEVER PUT NUKES IN IT. PERIOD.
