Wiktionary
n. (context aviation English) The precise movement of a civil photogrammetric aircraft along a predetermined course at a predetermined altitude during the actual photographic run.
WordNet
n. place where airplanes are parked and the maintenance hangars (but not the runways or taxiways)
Usage examples of "flight line".
F'lar glanced behind him, saw the other dragonmen form the flight line, spread out to cover the gaps of those still on guard at Ruatha Hold.
And, to avoid tipping off any spy that they were about to activate, crews would occasionally wear civilian work clothes over their flight suits when going to the flight line for a mission.
We were sitting in a sort of gray-plastic office near the flight line.
And he wasn't surprised when they taxied back to the flight line and he saw the girl standing there, waiting for them, as if she hadn't moved at all the whole time they were gone, and somehow he believed that to be true.
As the pilots shuffled out the door to head to the flight line, the general went over to the lieutenant.
He changed back to vertical and went straight up, but this time the ship tiltedapparently by some automatic device, since he knew of no forward and backward tilting control-^-and kept her blunt nose facing the flight line.