The Airbus A321 and A321XLR, while similar in appearance, have distinct differences that set them apart. Both aircraft are integral to many airlines' narrowbody fleets, but they cater to different needs.
The most notable difference between the two is their range capabilities. The A321-100 and -200 variants can travel just over 3,000 nautical miles, according to the Lufthansa Group. In contrast, the A321XLR offers a range of nearly 5,000 nautical miles as reported by Airways Magazine. This extended range is primarily due to its fuel tank configuration. While the A321-200 can be equipped with additional auxiliary fuel tanks, the XLR features several more tanks along with a larger rear center tank.
There are also aesthetic differences in their fuselage designs. The A321 has "Type C" emergency exit doors that resemble boarding doors. The XLR's exits vary but typically include traditional over-wing window exits due to its lower density configuration. Additionally, behind the XLR's wings is a misaligned "plug" style window which allows for flexible seating configurations.