NASA approaching ex-SR-71A Blackbird Staff About Restart

Posts
7,067
Likes
13,041
In total, Lockheed built 50 Blackbirds ( 15 x A12, 3 x YF-12A , 32 x SR-71 )

@Felix_La_PuBelle
The D-21 reconnaissance drone project was continued as D-21B atop an Avanti A-92 booster under Project "Senior Bowl", launched from the left wing of a B-52H.
 
Posts
1,020
Likes
5,938
In total, Lockheed built 50 Blackbirds ( 15 x A12, 3 x YF-12A , 32 x SR-71 )

@Felix_La_PuBelle
The D-21 reconnaissance drone project was continued as D-21B atop an Avanti A-92 booster under Project "Senior Bowl", launched from the left wing of a B-52H.

Yep. I read that they added a booster and switched to dropping from a B-52. I don’t have info on why the missions over China were unsuccessful.