Perhaps the most distinctive variation on the successful Islander theme was the BN-2A Mk III Trislander. Flown for the first time on 11 September 1970, this had a lengthened fuselage with capacity for up to 17 passengers and also featured a third engine mounted in a much modified tail unit assembly. Production was launched not long after and 12 were subsequently built in the USA by the International Aviation Corp as the Tri-Commutair Other versions were the increased MTOW BN-2A Mk III-1, long nosed Mk III-2 and auto-feather-equipped Mk III-3. The last of 73 UK-built aircraft was delivered in September 1984.

Robert Hewson "The Vital Guide to Commercial Aircraft and Airliners", 1994