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1965年5月1日，美国加利福尼亚州爱德华兹空军基地，美国空军YF-12A原型机创造出80257英尺持续高度和2070英里时速世界飞行记录，飞行员是罗伯特·斯蒂芬斯（Robert L. Stephens）和丹尼尔·安德烈（Daniel Andre），尽管YF-12A试飞与测试的结果让美国空军非常满意，决定由洛克希德生产93架F-12B量产型，国会也同意拨款，但时任国防部长麦克玛拉以越战需要庞大军费和没有必要专门生产一种拦截机为理由终止了F-12B的生产计划。（Conceived as a triple-sonic interceptor aircraft, the YF-12 had all of the blazing performance of its more famous sister aircraft, the SR-71 Blackbird. On May 1, 1965, the YF-12 set no less than nine world absolute speed and altitude records at Edwards Air Force Base. Among these was a sustained altitude of 80,257 feet and a speed of 2,070 mph. In spite of this performance and operational potential, the aircraft never entered production.）