The Airbus A321 and the Boeing 757 are both long-range, high-capacity twin-engine aircraft that serve as the backbones of high-capacity narrowbody operations all across the globe. Each of these jets brings a lot to the table, including game-changing fuel efficiency and best-in-class range capabilities. The Airbus A321 and the Boeing 757 each offer operators the opportunity to serve longer-range routes without the need to add an expensive and costly-to-operate widebody jet to their fleets.