Northrop akanga achiri asina nechivimbo pamusoro kubhururuka-ne-waya chidhiraivho uye akaramba mechanically-chiratidzo ndege chidhiraivho. The kunoguma ndege, rakavhurwa musi waJanuary 28, 1971, akazivisa kunonyanyisa uremu 40,000 lb (18,144 makirogiramu) uye kunonyanyisa nokukurumidza Mach 2, asi akamutsa shoma kufarira pakati vatorwa vatorwa. The zvikabva ndege (serial nhamba 72-156 mph) akanga vakatasva pana Hawthorne Fighter musi waApril 4, 1974; ndege yayo yokutanga pana Edwards AFB akauya musi June 9 pamwe "Hute" Henry Choute panguva chidhiraivho, kusvika 61 maminitsi kubhururuka urefu 18,000 tsoka uye kunonyanyisa nokukurumidza maawa 610 uye maneuvera.
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