Suomen Ilmailumuseo: Finnair Convair 340/440 Metropolitan (OH-LRB) Built at the Convair factory (San Diego, CA) in April 1953 OH-LRB is the longest-serving aircraft in the history of Finnair Originally constructed as a 44-seat Convair 340-type airliner, but converted to a larger, 52-seat Convair 440 Metropolitan in 1956. 20/06/2018