The major production model was the FD, which first flew 23 October and entered service in Note: Northrop company designations include a wide variety of technologies. Another inspection of the mock-up was held on 17 December, and the inspectors suggested only minor changes, even though the fuselage fuel tanks were still above the engines. The new nose added 3 feet 0. The delivery date of the first aircraft was scheduled 14 months July from signing and the second 2 months after that. Retrieved: 25 September Problems with the fire-control system delayed the -H's entry into service, by which time its performance was notably inferior to newer supersonic interceptors, so it was phased out of USAF service by
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