FS#6493 - Helicopters do not autorenew/autoreplace while in routes consisting of heliports
Helicopters are serviced each time they take off from an helipad/heliport, but do not autorenew or autoreplace on helipads.
Old helicopters with routes involving only heliports (no hangars) are not headed to an airport with a hangar when they need autorenewing or autoreplacing.
By the way, the DEPOT_LOCATE_HANGAR flag is currently unused.
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