在90年代,西方四大发动机公司除竞争发展100座级飞机的发动机外,还在竞争发展大型商用飞机的发动机。为满足客户的不同需求,这些公司一方面不断改进现有发动机,另一方面为波音777新研制了几种发动机,这几种发动机在90年代中期前后投入使用。120～200座飞机的发动机波音、麦道和空中客车公司预计到2004年民用飞机销售最多的 In the 1990s, the four Western engine companies competed for the development of engines for large commercial aircraft in addition to the competition for the development of 100-seat aircraft engines. To meet the different needs of their customers, these companies continuously improve their existing engines while on the one hand, and on the other hand, they have developed several new engines for the Boeing 777, which were put into operation around the mid-1990s. 120 to 200 aircraft engines Boeing, McDonnell Douglas and Airbus expect 2004 sales of civilian aircraft up to