Originally Posted by
Lomapaseo
I think it's a misnomer to use the word hangar in this question.
Planes in hangars are typically under repair (including inspections) and can't be rushed. Once they pass inspection they are rolled out on a ramp separate from any that might be waiting for hangar space. This flow doesn't lend itself to last minute changes which invaribly are needs at other airports
I know many airlines would park inefficient jets in hangers in perfect safety conditings that are capable to subtitude any missions in their hubs that their efficient and primary jets can't support to due to delay/plane out-of service etc.