在美国2000年以后服役的飞机中,有80％～85％仍然是今天正在使用的飞机。通过增加新飞机来提高作战能力已不再是主要途径。近几年来,每年生产的新的军用飞机数量已呈现下降的趋势。一般说来,一种装备在部队服役多年之后,其后继装备才能出现。因此,美空军不能只依靠获得新装备来提高作战能力和实现现代化,而是需要利用先进技术来改进现有装备来达到这一目标。 Between 80% and 85% of the U.S. aircraft serving after 2000 are still the ones that are in use today. Increasing combat capability by adding new aircraft is no longer the main route. In recent years, the number of new military aircraft produced annually has shown a downward trend. In general, a piece of equipment in the military service after many years, its successor equipment to appear. Therefore, the U.S. Air Force can not rely solely on new equipment to enhance its combat capability and modernize. Instead, it needs to use advanced technologies to improve existing equipment to achieve this goal.