The Boeing 757 is a mid-sized, narrow-bodied twin-engine jet airliner featuring a two-crew glass cockpit. Being the largest single-aisle passenger aircraft in the world, it has a capacity of up to 289 passengers and a range of 3,150 up to 3,900 nautical miles depending on the variant. It shares design features with the Boeing 767, which allows pilots to have the same type rating in order to operate both aircraft. The 757-200 is the most common variant still in operation all over the world. The airlines that primarily use the Boeing 757 include Delta Air Lines, United Airlines, and American Airlines.