Built for Northwest Airlines in 1956 and later flew with Sterling Airways in Europe. Imported by Conair in 1974, it was one of a pair converted for pollution control where chemicals were pumped out of the large pipe in the tail. Oil spill dispersal in the Gulf of Mexico was what they worked on so here probably only for some maintenance related reason. Later converted for water dropping and cancelled in August 1994 after being scrapped at Abbotsford/BC.