But the vehicle is not parked in a public space it's parked on private property that is owned by the government. If someone is in a vehicle on someones property

But the vehicle is not parked in a public space it's parked on private property that is owned by the government. If someone is in a vehicle on someones property then it's the property owner not the vehicle owner were trespassing laws apply to. The Airline is as much a guest in an airport as the passenger is.