Assertion: aircraft | /r/CapableOf | fly at 60,000 feet
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Source sentences:
text: Richard Leghorn of the United States Air Force (USAF) suggested that an aircraft that could fly at 60,000 feet (18,300 m) should be safe from the MiG-17, the Soviet Union's best interceptor aircraft, which could barely reach 45,000 feet (13,700 m).