What about the next generation of air-traffic control systems that promise to use GPS satellites and radio transponders to warn all aircraft in a given area about the presence of others?

• 接下来就是空中交通管制的问题了。自从福特汽车放弃了其公开销售飞行汽车的计划后，也许很多事情都发生了变化，但是在当下空中交通的重担下，现在的陆基雷达早已趋于饱和。