

Having it in a pocket realm in the Astral accessible by a mundane item off to the side in the ‘fake’ vault filled with low level junk magic items
The pocket realm also does not have any air becuase the BBEG is prepared with their own contingencies, and of course right on the other side of that airless door are a few very persistent golems there to hug anyone who enters
it’s more for older models where overengineering for ridiculously smooth transitions at the cost of greater wear and maintenance. Considered acceptable as a person who owns a jaguar likely owns several cars and it isn’t a burden for frequent maintenance
People who can barely afford Jaguars learn the hard way that it was meant as a weekend car