sentences:  Further fleet growth came in 1980 when Air North became an operator of the Grumman Gulfstream I-C (G-159C) regional airliner, a 37-seat stretched conversion of the Grumman Gulfstream I turboprop executive aircraft.Powered by Rolls Royce Dart engines, the Grumman I-C was used by Air North on routes requiring greater speed and passenger capacity than was possible with the airline's Shorts 330s.Air North was one of the very few airlines to ever operate the Gulfstream I-C propjet in scheduled passenger service.