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Civil registration of US military planes
Sorting part of my photo library, I came across a photograph of the Boeing B-299, progenitor of the B-17 breed. It wears both military markings and a civil registration: X-13372.
This is not uncommon, but what puzzles me is that "X". All previous civil registrations I have seen were in the "NX" range.
Can someone shed some light?
Thanks.
Chris
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