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Design Deep Dive: Why the Airbus A321 Lacks the Boeing 757's Mid-Cabin Boarding Door

The Boeing 757 frequently uses a mid-cabin door for boarding, a feature noticeably absent on the similarly sized Airbus A321. This distinction stems from fundamental differences in aircraft design and wing placement. The 757's wings are set further forward on the fuselage, creating space for a full-sized boarding door behind the wing. Conversely, the A321 is a stretched A320, resulting in a more rearward wing position. This places the main wing box structure exactly where a second boarding door would be, making its installation structurally impractical and necessitating smaller over-wing emergency exits instead.

Official Source: https://simpleflying.com/why-doesnt-airbus-a321-board-mid-cabin-boeing-757/