NCL arranged for our flights from JFK to Miami, sailing today 2/24/19. Flight was scheduled to leave at 9am, and all was well. We boarded the flight, they were ready to shut the doors, then they kicked everyone off the plane (American Airlines).   Apparently AA had a flight going to Vail CO that didn't have a high altitude plane assigned to them. Our plane that we were sitting on was. So instead of cancelling the CO flight and inconveniencing those passengers, they kicked all of us off