An extensively modified version of the F-102 Delta Dagger was developed during 1955 under the designation of F-102B but the changes became so extensive that the designation was eventually changed to F-106. The delta wing remained substantially unchanged, but the fuselage was modified to accommodate more powerful Pratt & Whitney J-75 turbojet. Engine intakes were re-located behind the cockpit and were variable for optimum engine performance at all speeds. The cockpit was moved forward relatively, and the shape of the fin and rudder changed. A new undercarriage was fitted, with steerable twin nose wheels. The Convair NF-106B Delta Dart had a new cockpit containing two seats in tandem.

The NF-106B Airplane was delivered to NASA Langley Research Center January 29, 1979, for a flight test program on Wing Leading Edge Vortex Flaps being performed at that Center. This airplane with the designation of Serial # 57-2516 (later NASA 816) was never flown at NASA Hugh L. Dryden Flight Research Center. At the present time it is officially still on loan to NASA Langely Research Center.