Which of the following airspace is ATC required to provide aircraft separation?

ATC Clearances and Separation. An ATC clearance is required to enter and operate within Class B airspace. VFR pilots are provided sequencing and separation from other aircraft while operating within Class B airspace.



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Classes A, B, C, and D are all types of controlled airspace that require communication with ATC. Class E is the only controlled airspace that does not require communication with ATC.

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In controlled en route airspace, the horizontal separation standard between aircraft flying at the same altitude is 5 nm (9260 m). In terminal area airspace, the minimum separation is 3 nm (5500 m).

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Class B airspace surrounds the busiest airports from the surface to 10,000 feet MSL. The dimensions of Class B airspace vary depending on the needs of the airport. Class C airspace extends from the surface to 4,000 feet MSL.

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To enter Class B airspace, all aircraft must meet the following requirements:
  • ATC clearance required to enter.
  • Establish and maintain two-way communication prior to entering and while in airspace.
  • Mode C transponder (within 30 nm, up to 10,000 feet msl)
  • Student pilot operations restricted.


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Class G is usually found below 1,200 feet where Class E airspace typically starts, although there are of course exceptions. Class G is more prevalent and may be found at lower altitudes in less dense areas of the country where IFR operations are less common.

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