How The Boeing 737's Seating Configuration Differs Across US Airlines In 2026

The Boeing 737 isn't the world's most common airliner anymore; that would be the Airbus A320 instead. Within the US, however, the 737 reigns supreme, as it is the most common aircraft type operated within the country. Eight passenger airlines operate almost 2,500 737s, which means that there's a lot of variance in how these planes may be configured inside. Much of this depends on the business model that the airlines are operating, although they are all configured to operate domestic flights as per aeroLOPA.