The ATR 42-600 The 42-600 is a twin-engine commuter airliner with a high-wing turboprop, that can seat up to 50 passengers. It took its first flight in March of 2010 and was introduced into service in late 2012. Distinctive in appearance with elegant lines and curves, it boasts thoroughbred performance in the air and can operate out of a wide variety of airfields. The 42-600 is an advanced iteration of the ATR 42, a family of regional airliners first conceived in the early 1980s. Named “42” due to the number of seats of the original version, the aircraft was designed to be a highly efficient airframe optimized for commuter lines.