flight altitude

minimum flight altitude

flight altitude envelope

flight restriction zone / flight restricted zone (FRZ)

altitude

altitude barrier

altitude dial

altitude performance

altitude separation

cruising altitude

gain altitude

high altitude

high altitude-high opening (HAHO)

high altitude-low opening (HALO)

high- and low-altitude surveillance

high-altitude long-endurance (HALE)

high-altitude low-opening parachute technique (HALO)

high-altitude nuclear burst

keep-out altitude

low altitude parachute extraction system (LAPES)

operational altitude

relative altitude

subsonic low altitude cruise missile

surveillance, high- and low-altitude surveillance

theater high altitude air defense (THAAD) system

transition altitude (TA)

Height Above Ellipsoid (HAE); altitude / elevation above the ellipsoid (ellipsoidal height)

airborne targeting low altitude navigation thermal imaging and cueing (system)

altitude-staggered antimissile defense

high altitude arrival waypoint

low altitude arrival waypoint

low-altitude departure waypoint

altitude at future position