题目内容
In the United States and Southern Domestic Airspace of Canada, airspace from 18000 to 60000 feet is _______ as class A, requiring an IFR clearance for all aircrafts.
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A clearance always _______ a clearance limit, which is the farthest the aircraft can fly without a new clearance.
Separation may also be referred to as ________.
The clearances will allow ATC to ________ the arrival of aircraft at major airports, which increases airport capacity.
The weather is considered to be IMC when it does not ____ the minimum requirements for VMC.
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