Earlier this year, United Airlines signaled the removal of the Airbus A350-900 aircraft type from its order book. As per the SEC or Securities and Exchange Commission 10-K filing, this decision was made on the basis that the engine manufacturer for the aircraft type had breached a contract. So in this video, we take a look at how a contract dispute between United Airlines and Rolls-Royce has placed one of the airline industry’s longest-running aircraft orders in doubt, why a $175 million payment is now at the center of a legal battle, and how the future of 45 Airbus A350s suddenly became uncertain.