Black Projects: Time from First Flight to Public Announcement
By Peter W. Merlin

The time between first flight and public announcement of Black Projects varies wildly:

ProjectFirst FlightPublicly Announced
U-219551957
A-1219621981 (existence declassified 1976, but not announced)
YF-12A19631964
SR-7119641964
HAVE BLUE19771990 (existence known earlier in aviation press)
F-117A19811988
TACIT BLUE19821996
Bird of Prey19962002
X-44 Manta20012018
P-175 Polecat20052006
RQ-17020052009
RQ-1802010still not yet made public as of early 2023


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