sentences:  Air North ended its Allegheny Commuter relationship in the late 1970s and expanded service in New York state and New England into the early 1980s.The airline's fleet was also expanded with the addition in 1979 of 30-seat Short 330 commuter airliners.These larger turboprop aircraft joined the Air North fleet shortly before the 1980 Winter Olympics held at Lake Placid, New York near Air North's service point of Saranac Lake.