美国这方面的法制很发达，大致可以分为一般管制和特殊管制两方面。
The USA's legal system in this respect is very developed and can be divided into general governing and especial governing approximately.
一般来说，从地面以上365米的高度，整个国家都被管制空域覆盖。
In general, from 365m above the ground and higher, the entire country is blanketed by controlled airspace.
虽然一般来讲，交通管制员对飞机着陆是否安全最有发言权，但他们可以留待飞行员自行判断。
While traffic controllers generally have the final word in whether it is safe for a plane to land, they can and do leave it to the pilots' discretion.
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