sentences:  The Clinton Aero fleet had included the Beechcraft 1900 19-seat regional airliner and additional orders for the B1900 turboprop were made by the new Brockway Air.By 1985, the fleet had been rationalized around the F.27 and the B1900 and service was further expanded through growth of the Binghamton hub (30 weekday flights by September 1985) and the addition of flights between key northeast markets such as Buffalo-Washington, Syracuse-Newark and Burlington-Boston.As Brockway Air expanded, the airline was increasingly in competition with larger airlines operating in the northeast region.