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Designating a policy under which aircraft, especially commercial aircraft, of any nation are allowed to fly into a particular territory.
1940s; earliest use found in The Richmond Times-Dispatch.
雅致网英汉双解词典包含236457条英汉翻译词条，涵盖了常用英语单词及词组短语的翻译及用法，是英语学习的必备工具。