------
Interestingly, airplanes can also get repossessed. Special pilots get all the legal paperwork arranged and just show up and fly a plane out.
I suppose the high skill needed means that most pilots wouldn't want to steal airplanes, and it would not make sense to steal any airplane that needs special support from the manufacturer (the new owner can't keep it flying). Cars are much lower skill to steal and maintain and have a much broader market.