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How about an airliner?
It’s Official: The Re-Engined B-52 Will be the B-52JAs soon as they get new engines, B-52H bombers will be designated as B-52J aircraft, Air Force budget documents show.www.airandspaceforces.com
There is a lot of vacant letters in the alphabet yet!
Very loosely.Why not?
Boeing's 747 started out as a USAF proposal for a heavy-lift transport, which the C-5 Galaxy won out, so it developed into what we know today.