Controlled airspace is that airspace in which FAA regulations apply.

管制空域是指适用 FAA 规定的空域。

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On a clear day, a pilot in controlled airspace can choose a VFR or IFR flight plan, and the FAA regulations were devised in a way which accommodates both VFR and IFR operations in the same airspace.

在晴天，在管制空域内的飞行员可以选择目视飞行规则或者仪表飞行规则的飞行计划，而且联邦航空局的条例是以这样一种方式设计的：在同一空域同时适用目视飞行规则和仪表飞行规则的操作。

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There is, however, a loophole in those FAA regulations: weight.

然而，FAA的规定是有漏洞的，那就是重量。

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For U.S. carriers, sleeping while at the controls is a violation of FAA regulations.

CNN: Dutch 737 pilot locked out of cockpit while co-pilot sleeps

We weren't allowed to--nor did we want to--manipulate the story so that they were doing anything that didn't adhere 100% to FAA regulations and Virgin's employee manuals because that becomes brand damaging.

FORBES

Freudenberg, a former Army helicopter pilot who served in Iraq, had worked for the company just under a year, and probably wanted to avoid revealing that he had taken off with inadequate fuel, which is a violation of FAA regulations, investigators said.

CNN: Pilot texting a factor in deadly copter crash