Message posted by Peter Merlin (Member since 11/13/2003) on April 15, 2023 at 12:33:55 PST:
These non-standard YF designations were created for use in unclassified documents such as pilot flight logs and maintenance records. In the past, some test pilots have posted biographical information online including lists of the aircraft they flew.
In Reply to: Re: Questions about black projects posted by Altner on April 15, 2023 at 10:20:58 PST:
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