hangar queen

noun2

1. •
   (slang) A grounded aircraft which is kept so that its parts can be used in other aircraft.

   • In the Air Forces, "Hangar Queen" is not a proud title. It refers to any grounded plane which is being systematically "cannibalized" (stripped of its parts) so that other planes may fly. — 1944
2. •
   (slang) An aircraft which requires a great deal of regular maintenance and has an unfavorable ratio of maintenance time to flight time.