What type of aircraft configuration is characterized by having two aisles?

The type of aircraft configuration characterized by having two aisles is indeed widebody. Widebody aircraft are designed with a wider fuselage, which allows for two aisles and typically accommodates a larger number of passengers compared to narrowbody aircraft. This configuration is particularly beneficial for long-haul flights, as it provides increased seating capacity and more comfortable cabin layouts, including options for business and first-class seating. The two aisles facilitate easier movement within the cabin, making it convenient for passengers boarding, deplaning, and accessing lavatories or overhead storage.

In contrast, narrowbody aircraft, which often have a single aisle, are generally used for short to medium-haul flights and typically have fewer seats. Single-aisle refers specifically to the layout with one aisle, which limits passenger access compared to widebody cabins. Regional jets, usually smaller in size and designed for short distances, also follow a narrowbody configuration and do not feature a dual-aisle setup.