Message posted by Andreas Parsch on March 28, 2002 at 4:53:08 PST:
X-series and F-series (and all others as well) use independent numerical sequences (e.g. there are X-15, F-15, C-15, XV-15, etc., all unrelated to each other). The "F-35" is actually a misnomer - it should have been the F-24. BTW, the X-sequence has reached X-50 by now. I have a website devoted to the subject:
Go to the "Links" page, and the first few links in the "Aircraft" section include some good references on the U.S. military aircraft designation system(s), including lists of assigned designators.
I have a website devoted to the subject:
In Reply to: Re: missing numbers posted by Russ on March 28, 2002 at 4:26:52 PST: