缔约一方航空当局在批准运价时可附加他们认为合适的失效期。
In approving tariffs, the aeronautical authorities of a Contracting Party may attach to their approval such expiry dates as they consider appropriate.
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.
美国航空当局正在调查，两架准备降落的客机在接近机场时，华盛顿附近的里根机场中的空中管制员是不是睡着了。
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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