North American XB-70 Valkyrie - Variants

Variants

XB-70A

Prototype of B-70. Two were built.

• AV-1, NAA Model Number NA-278, USAF S/N 62-0001, completed 83 flights spanning 160 hours and 16 minutes.
• AV-2, NAA Model Number NA-278, USAF S/N 62-0207, flew 46 times over 92 hours and 22 minutes, before it crashed in June 1966.

XB-70B

AV-3, NAA Model Number NA-274, USAF S/N 62-0208, was originally to be the first YB-70A in March 1961. This advanced prototype was canceled during early manufacture.

YB-70

Planned preproduction version with improvements based on XB-70s.

B-70A

Planned bomber production version of Valkyrie. A fleet of up to 65 operational bombers was planned.

RS-70

Proposed reconnaissance-strike version with a crew of four and in-flight refueling capability.