Which aircraft type is most commonly associated with swivel seats?

The A320 model, specifically the original A320 configuration, is most commonly associated with swivel seats. These seats are designed for efficient space management and passenger comfort in narrow-body aircraft like the A320. Swivel seats allow for adaptability in seating arrangements, making it easier for crew members to assist passengers and for passengers to access overhead bins without obstruction.

The other aircraft types mentioned, such as the A321 and its NEO variant, generally offer different seating configurations that may prioritize additional passenger capacity or comfort features rather than the swivel seat design. While all these aircraft types may share some design elements, the distinction of swivel seats is particularly tied to the A320 model due to its operational history and versatility in different airline configurations. Thus, the identification of the A320 as the aircraft most associated with swivel seats is grounded in its specific design choices and market usage.