When was the X-15 rocket plane program initiated? 1940s 1950s 1960s 1970s None Which aircraft manufacturing company built the X-15 rocket plane? Boeing Lockheed North American Aviation McDonnell Douglas None What was the maximum altitude reached by the X-15 rocket plane during its flights? 50,000 feet 100,000 feet 200,000 feet 354,000 feet None How many X-15 rocket planes were built in total? One Two Three Four None Which astronaut perished at high altitude while flying in the X-15 rocket plane? Neil Armstrong John Glenn Buzz Aldrin Michael Adams None Time's up
