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While the 747-100 powered by Pratt & Whitney JT9D-3A engines offered enough payload and range for medium-haul operations, it was marginal for long-haul route sectors. The demand for longer range aircraft with increased payload quickly led to the improved -200, which featured more powerful engines, increased MTOW, and greater range than the -100. A few early -200s retained the three-window configuration of the -100 on the upper deck, but most were built with a ten-window configuration on each side.[154] The 747-200 was produced in passenger (-200B), freighter (-200F), convertible (-200C), and combi (-200M) versions.[155] The 747-200B was the basic passenger version, with increased fuel capacity and more powerful engines; it entered service in February 1971.[82] In its first three years of production, the -200 was equipped with Pratt & Whitney JT9D-7 engines (initially the only engine available). Range with a full passenger load started at over 5,000 nmi (9,300 km) and increased to 6,000 nmi (11,000 km) with later engines. Most -200Bs had an internally stretched upper deck, allowing for up to 16 passenger seats.[156] The freighter model, the 747-200F, had a hinged nose cargo door and could be fitted with an optional side cargo door,[82] and had a capacity of 105 tons (95.3 tonnes) and an MTOW of up to 833,000 pounds (378 t). It entered service in 1972 with Lufthansa.[157] The convertible version, the 747-200C, could be converted between a passenger and a freighter or used in mixed configurations,[78] and featured removable seats and a nose cargo door.[82] The -200C could also be outfitted with an optional side cargo door on the main deck.[158] The combi aircraft model, the 747-200M (originally designated 747-200BC), could carry freight in the rear section of the main deck via a side cargo door. A removable partition on the main deck separated the cargo area at the rear from the passengers at the front. The -200M could carry up to 238 passengers in a three-class configuration with cargo carried on the main deck. The model was also known as the 747-200 Combi.[82] As on the -100, a stretched upper deck (SUD) modification was later offered. A total of 10 747-200s operated by KLM were converted.[82] Union de Transports Aériens (UTA) also had two aircraft converted.[159][160] After launching the -200 with Pratt & Whitney JT9D-7 engines, on August 1, 1972, Boeing announced that it had reached an agreement with General Electric to certify the 747 with CF6-50 series engines to increase the aircraft's market potential. Rolls-Royce followed 747 engine production with a launch order from British Airways for four aircraft. The option of RB211-524B engines was announced on June 17, 1975.[144] The -200 was the first 747 to provide a choice of powerplant from the three major engine manufacturers.[161] In 1976, its unit cost was US$39M (185.7M today). A total of 393 of the 747-200 versions had been built when production ended in 1991.[162] Of these, 225 were -200B, 73 were -200F, 13 were -200C, 78 were -200M, and 4 were military.[163] Iran Air retired the last passenger 747-200 in May 2016, 36 years after it was delivered.[164] As of July 2019, five 747-200s remain in service as freighters.[165]