The standard flight rule for all aircraft is to avoid any thunderstorm activity, and yet Frank shows no fear by staying on course.

所有飞机的标准飞行准则是要避免雷暴活动，而Frank还是照原路前进，没有丝毫恐惧。

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The direct cause of the damage and crash of the Chinese airplane was that the U.S. plane suddenly veered into the Chinese jet, which was against flight rule.

中方飞机坠毁的直接原因，是美机违反飞行规则突然向中方飞机转向、接近造成的。

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An important rule is to drink plenty of water during any flight.

一条重要的原则是在任何一次飞行中都要喝大量的水。

《柯林斯英汉双解大词典》

So, even though Congress ordered the FAA to issue a rule prohibiting airline flight crews from personal use of electronic devices in the cockpit in January of last year, no rule has been issued to date.

FORBES: FAA Foot-Dragging on Rule to Prohibit Texting and Flying

But for travellers who dread the prospect of a long taxi ride on top of a cross-country flight, the perimeter rule is an unnecessary hassle.

ECONOMIST: Airports in Washington, DC: Breaching the perimeter | The

No flight has been that dismal since the rule was put in place, the DOT said.

WSJ: The Worst Flight in America