Sjeldne fly - XF-108

Selv om denne aldri fløy, var den et viktig skritt videre mot både XB-70, YF-12A og Vigilante. 

Fra Wikipedia

 

The North American XF-108 Rapier was a proposed long-range, high-speed interceptor aircraft designed by North American Aviation intended to defend the United States from supersonic Soviet strategic bombers. The aircraft would have cruised at speeds around Mach 3 (2,013 mph; 3,240 km/h) with an unrefueled combat radius over 1,000 nautical miles (1,900 km; 1,200 mi), and was equipped with radar and missiles offering engagement ranges up to 100 miles (160 km) against bomber-sized targets.