美国航空一架客机与军方直升机在华府上空相撞，造成67人丧生，这起空难发生时，雷根华盛顿国家机场（Reagan National Airport）塔台内1名航管员同时负责2人份工作。CNN专题报导指出，这并非个案，并指出美国多数机场 ...

"The Blackhawk helicopter was flying too high, by a lot. It was far above the 200 foot (roughly 61 meters) limit. That's not really too complicated to understand, is it???" Trump said in a post on ...