If you mean whilst still in use by an airline but not operating then either on the ramp or, if the period until it's next the next flight is more than a couple of hours it may be moved to a maintenance area or hangar. read more
If you mean whilst still in use by an airline but not operating then either on the ramp or, if the period until it's next the next flight is more than a couple of hours it may be moved to a maintenance area or hangar. Once an airline no longer needs an aircraft it may move into long term storage. read more