Wiktionary
hangar queen
alt. 1 (context idiomatic slang military aviation English) A grounded aircraft which is kept so that its parts can be used in other aircraft. 2 (context idiomatic slang aviation English) An aircraft which requires a great deal of regular maintenance and has an unfavorable ratio of maintenance time to flight time. n. 1 (context idiomatic slang military aviation English) A grounded aircraft which is kept so that its parts can be used in other aircraft. 2 (context idiomatic slang aviation English) An aircraft which requires a great deal of regular maintenance and has an unfavorable ratio of maintenance time to flight time.
WordNet
hangar queen
n. an airplane with a bad maintenance record