The plane circled, awaiting permission to land.

飞机盘旋着，等待着陆指令。

《柯林斯英汉双解大词典》

Getting permission to land can be another hassle altogether.

而申请着陆许可证可以说是另一件麻烦事。

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Bigapple. This is helicopter. Request permission to land on deck.

直升飞机请求允许在甲板上降落。

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The crews would have to radio those ports from out at sea and request permission to land.

VOA: special.2009.02.10

But the governor of the Riau Islands refused the boat permission to land.

VOA: standard.2009.10.27

To land,foreign fishing ships will have to request permission from ports that are able to inspect them.

VOA: special.2009.12.08

Conspiracy theories (bunk, probably) abound that the plane was running out of fuel and was denied permission to land in nearby Bagram airport, a U.S. base.

FORBES: Magazine Article

In the early days of the uprising against her father, she was reportedly on a Libyan Arab Airlines turbo-prop plane that was refused permission to land in Malta.

MSN: Hundreds of foreigners leaving Tripoli - World news - Mideast/N. Africa | NBC News

The minister told CNN that Aristide had been granted permission to land in the country after Aristide himself -- as well as the U.S. and French governments -- requested it.

CNN: Aristide says U.S. deposed him in 'coup d'etat'