At first I believed the antagonistic "chase" Sabre was the only indestructible vehicle: it features in 'Tanker Commander'.
However it turtle-flipped, burned & blew up, general vulnerability bummer.
Can't recall mission name or what motivated me later to physically push the locked "chase" Maverick to the Meadows hanger.
Rather than turn the Mini-Gun on it to test resistance I flew over adjacent base.. low & slow.
It shrugs off sidewinders & SAM site launches until it(actually) bores you to be fully indestructible.
Eventually I towed the chopper instead...piece of cake.