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Thank you so much Andreas for your ever so captivating explanations. I for one could read on without getting tired as the subject of US designations absolutely fascinates me...
In the same vein as Bell using F-109 commercially without any approval of either the designation or the type, I'm also thinking of the recent Lockheed T-50 trainer, which apparently has forced the USAF to skip that number and proceed directly to T-51... Sikorsky's efforts with H-76 and H-92 probably would lead to the same situation if these numbers weren't so far from today's mark (though H-76 is now getting pretty close).
In the same vein as Bell using F-109 commercially without any approval of either the designation or the type, I'm also thinking of the recent Lockheed T-50 trainer, which apparently has forced the USAF to skip that number and proceed directly to T-51... Sikorsky's efforts with H-76 and H-92 probably would lead to the same situation if these numbers weren't so far from today's mark (though H-76 is now getting pretty close).