题目内容
A flight operating under IFR is required to provide _______ if ATC advises a pilot that the plane is not visible on radar.
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In uncontrolled airspace, IFR aircrafts separate themselves from each other by using charted _______ altitudes to avoid terrain and obstacles.
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.
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 ________.
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