Which type of aircraft is classified as a narrowbody?

The correct classification of a narrowbody aircraft is defined by having a single aisle that connects the rows of seats. This characteristic allows for a configuration that typically accommodates one or two seats on each side of the aisle, making it more suitable for short to medium-haul flights. Common examples of narrowbody aircraft include the Boeing 737 and Airbus A320, both widely used for regional travel.

In contrast, aircraft with multiple aisles typically fall into the widebody category, which are designed for larger passenger capacities and often used for long-haul routes. The classification of an aircraft as narrowbody is focused on the aisle configuration rather than capacity or specific design purposes, such as cargo transport, which is irrelevant to the narrowbody definition. Therefore, single aisle is the key characteristic that identifies narrowbody aircraft.