The Airbus A350 has firmly established itself as the world's most efficient twin-aisle jet, and its dominance is a primary catalyst for why Boeing is fundamentally rethinking the path to its next new airplane. The success of the A350 essentially turned the performance of the Boeing 777X into a moving target that Boeing has struggled to hit for some time now. Delays have pushed the program significantly out of expected timelines, but the A350's success in the meantime has only been more detrimental to the 777X program. When the 777X program launched in 2013, the competitive landscape was fundamentally different. The Federal Aviation Administration (FAA) has tightened oversight significantly following previous industry crises, extending certification timelines for every new aircraft program.