Manufacturing grew significantly because of the war. "In 1939 there were only three Australian firms producing machine tools, but by 1943 there were more than one hundred doing so." From having few front line aircraft in 1939, the RAAF had become the fourth largest allied Air force by 1945. A number of aircraft were built under licence in Australia before the war's end, notably the Beaufort and Beaufighter, although the majority of aircraft were from Britain and later, the USA. The Boomerang fighter, designed and built in four months of 1942, emphasised the desperate state Australia found itself in as the Japanese advanced.