They are common on all types (Boeing, Airbus, Embraer, CRJs), mostly to meet FAA 16g seat rule for transport category aircraft (FAR Part 25) manufactured after October 2009.
They are usually for passenger seats facing the bulkhead, also for side-facing seats in business class, lay-flat seats, and also common on business jets.
They are also available as pilot/passenger seat retrofits on most GA aircraft (172s, Cirrus, Piper, Mooney, etc.)
AmSafe is the major supplier of these airbags:
http://www.amsafe.com/products-servi...airbag-system/