operational flight/ flying

accident-free flying / mishap-free flying

mishap-free flying / accident-free flying

low flying aircraft / low-flying aircraft

flying hours / logged flight hours

logged flight hours / flying hours

operational flight information service

operational flight envelope

flight restriction zone / flight restricted zone (FRZ)

anti-low-flying aircraft missile

flying boat

flying bomb

flying control officer

flying properties

flying squadron

flying wing

non-flying squadron

unidentified flying object (UFO)

with flying colors

nap-of-the-earth (NOE) (ground-hugging / terrain masking / flying under the radar / hedgehopping)

achieve coordination in flying

flying ace goggles

flying command post

flying junction

flying torpedo

terrain-hugging air-breathing low-flying vehicles

mishap- / accident-free flying

flying life

accident-free flying

flying program

flying regulations

flying test bed

sail flying