What type of seat is commonly swivel-mounted on aircraft such as the A320?

The answer identifies the jump seat as the type of seat that is commonly swivel-mounted on aircraft like the A320. Jump seats are designed for use by crew members or authorized personnel and are typically located in strategic locations within the cockpit or cabin. The swivel-mounted feature allows crew members to turn and face different directions as needed, facilitating better interaction with passengers or other crew while maintaining safety protocols during takeoff, landing, or emergencies.

In the context of the A320, this configuration is particularly beneficial, as it enhances the functionality and usability of the jump seat for flight attendants and pilots who may need to maneuver quickly during various operational scenarios. While the other types of seats mentioned can serve specific functions within the aircraft, they do not typically include the swivel feature that is characteristic of jump seats.