air corridors

Noun

air corridor (plural air corridors)

1. A predefined route, or series of routes, in which a commercial or military aircraft must fly.
   • some were planning to fly into London from Europe, though, like many of us, they could only try their best to keep up with the government’s air corridor whack-a-mole.2020 August 29, Rebecca Nicholson, “Tom Cruise: another groundbreaking role for cinema's cheerleader”, in The Guardian

   Synonyms:

   air lane