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| preferential departure and arrival route (在两个机场之间的航线,而这两个端站在紧邻着航路交通管制中心 (ARTCC )的区域中。PDAR 和优先的仪表飞行规则 (IFR )航线的意义是不相同的,但他们基本上要实现相同的目的) | |||
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