飞机离不开机场和跑道。战争时期,敌对双方都把对方的机场和跑道作为攻击的主要目标,机场的跑道一旦被炸,飞机就无法起降。因此,一些国家研制出可以不依赖机场和跑道,能从公路上起降的战斗机。人们给这种飞机取了一个十分形象的名字:马路天使。瑞典有三种这样的战斗机,人们管它们叫“马路天使”三兄妹。亡们是Saab—35“龙”、Saab-37“雷”、JAS-39“鹰 The plane can not be separated from the airport and the runway. During the war, both hostile sides took each other's airports and runways as the main targets for attack. Once the airport runway was destroyed, the aircraft could not take off and land. As a result, some countries have developed fighter jets that can operate independently of airports and runways and can take off and land on the roads. People give the plane a very vivid name: the road angel. There are three such fighters in Sweden, where people call them the “siblings”. The dead are Saab-35 “Dragon”, Saab-37 “Thunder”, JAS-39 "Hawk