acre air traffic control american airlines assembly language automation autopilot bell system cfb north bay canada cape cod cathode ray tube charles babbage institute computer history museum federal aviation administration ferrite ground-controlled interception ibm interactive computing interceptor aircraft irwin allen light gun lincoln laboratory manhattan project massachusetts institute of technology mid-canada line modem moffett federal airfield north american aerospace defense command pinetree line quality control rand rca rotor radar real-time computing royal air force soviet union strategic air command surface-to-air missile system development corporation telephone the bomber will always get through united states air force uptime user interface vacuum tube western electric world war ii