Dependent on an airline's choice of installation, airplane airbags are most often installed in First class, Business class, Premium Economy, and Economy bulkhead/exit row seats. The seat belt-located mechanism can preclude concomitant use with seat belt extenders; i.e., the use of seat belt extenders deactivates the airbag mechanism. As a result, some airlines may require seat belt extender users to be reassigned to seats without airbags.