How many flight attendants are required for the A321 aircraft?

The requirement for flight attendants on an aircraft, such as the Airbus A321, is primarily dictated by the passenger seating capacity and the regulations established by the Federal Aviation Administration (FAA). According to FAA regulations, airlines must have a certain number of flight attendants based on the number of passengers and the configuration of the aircraft.

For the A321, which can typically accommodate a significant number of passengers (more than 200 in some configurations), the airline must deploy a sufficient number of flight attendants to ensure safety and compliance during emergencies. The minimum number ensures that there is enough crew to effectively manage the evacuation of passengers and provide assistance as needed.

A common standard, as stipulated by FARs, suggests that one flight attendant is required for every 50 passengers. Given the A321's passenger capacity, four flight attendants would be a typical requirement, allowing for adequate coverage in emergency situations and supporting in-flight service.

Other choices do not align with this requirement; two may be insufficient for larger configurations, while three could also fall short in ensuring adequate coverage for personnel safety and support. Similarly, five would exceed the minimum requirements for the majority of operational configurations of the A321.