distance between centres of lines；distance between centers of tracks；midway between tracks

distance offset distance

administration launch

advanced orbital launch operation

aerial launch

aerobic linked to pre-launch of film

Air Breathing Reusable Launch Vehicle

Air Launch

Air-Launch

Air-launch cruising

air-turbine pump launch system

all aspects attack of the launch platform

all purpose launch

allowable launch envelope

allowable launch range

all-purpose launch

ambulance launch

armament launch theory and technology

Ballistic missile launch-site