WE WERE PARKED AND UNLOADING OUR LUGGAGE AT THE AIRPORT. WE'D BEEN THERE APPROXIMATELY 20 MINUTES WAITING TO CHECK IN ON CURBSIDE. ALL OF A SUDDEN, OUR CAR STARTED ROLLING BACKWARD AND CRASHED INTO A CAR APPROXIMATELY 50 FEET BEHIND US. MY HUSBAND WAS RUNNING TRYING TO STOP THE IMPACT, THERE WAS NO REASON THAT THIS CAR SHOULD HAVE DONE THIS. IT WAS IN PARK FOR OVER 20 MINUTES!