空中交通调度员通过无线电和飞机保持联络。
Air traffic controllers were in radio contact with the aircraft.
美国航空当局正在调查，当两架飞机试图降落时，华盛顿附近的里根机场一名空中交通调度员是不是睡着了。
The aviation authorities in the United States are investigating whether an air traffic controller fell asleep at Reagan National Airport near Washington as two planes attempted to land.
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