Between 1987 and 1989, new Boeing 737s arrived to replace the older ones, and six Fokker 50s were added to the "Commuter" fleet. During 1990, after the passage of the deregulation act for the airline industry in Ireland, Aer Lingus reconsidered its operational policies. It retired the BAC One-Elevens and replaced them with five new 737s. In 1991, four Saab 340Bs arrived at the commuter division to replace the Short 360 aircraft. By 1992, Aer Lingus's entire original 737-200 fleet had been replaced and it was now the first carrier in the world operating all three versions of the second-generation 737. These were the −300, −400 and −500 series, although the −300 did not stay long in Aer Lingus service.