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In the 1930s, the Royal Air Force (RAF) was interested primarily in twin-engined bombers.[These designs put limited demands on engine production and maintenance, both of which were already stretched with the introduction of so many new types into service. Power limitations were so serious that the British invested in the development of huge engines in the 2,000-horsepower (1,500 kW) class to improve performance. During the late 1930s, none of these were ready for production. The United States and the Soviet Union were pursuing the development of bombers powered by arrangements of four smaller engines; the results of these projects proved to possess favourable characteristics such as excellent range and fair lifting capacity, and in 1936, the RAF also decided to investigate the feasibility of the four-engined bomber.
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At the war's end BOAC obtained more Mark IIIs and gradually came up with better accommodation for its passengers, in three configurations. Bench seats were removed, and civil-standard seating installed.
Sunderland T9044 was discovered on the seabed off Pembroke Dock in Wales in 2000.[51] The site is protected and recovery of the aircraft is ongoing
The 990 did not meet the specifications promised, and American Airlines reduced its order as a result.