The world's largest passenger aircraft can accommodate a maximum of 853 passengers, 200 more than the Boeing 747-400. In its 2-seat configuration, it can accommodate 575 passengers, almost three times more than the A320s.

The maximum number of seats in a commercial aircraft is currently held by the Airbus A380, which is certified for a maximum "exit limit" of 853 passengers in an all-economy configuration. While most airlines prefer a more luxurious three-class layout with around 500 to 550 seats, the A380's massive double-deck structure provides the largest "real estate" in aviation history. For comparison, the Boeing 747-8 Intercontinental has a maximum certified capacity of 605 passengers, though it is typically configured for about 410 to 467 seats. In 2026, the focus has shifted toward "twin-engine" efficiency; the Boeing 777-9 (777X) is expected to carry up to 426 passengers in a standard two-class setup, with a maximum limit nearing 450. A grounded observation: while high-density seating allows for lower fuel costs per seat-mile, most airlines avoid "maxing out" these numbers to preserve passenger comfort and ensure they can meet the rigorous 90-second emergency evacuation test required for certification. The era of the "853-seat" A380 remains the undisputed pinnacle of sheer passenger volume in a single airframe.