How far does Class B airspace go?

The upper limit of the airspace should not exceed 10,000 feet MSL. However, high airport field elevation, adjacent high terrain, or operational factors may warrant a ceiling above 10,000 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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An ATC clearance is required for all aircraft that receive separation services within the airspace. Even though you may be operating below the Bravo, you should use caution against operating too closely to the boundaries, especially where the floor of the Class B airspace is 3,000 feet or less above the surface.

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Once you are in the air, you must maintain communications with ATC while you are within Class B airspace. If you are taking off from a nontowered satellite airport within Class B airspace, establish two-way radio communications and get a squawk code from ATC as soon as possible after departure.

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Class B airspace locations must include at least one primary airport around which the Class B airspace area is designated. General Design. There is no standard Class B design. Instead, the size and shape of the Class B airspace area will vary depending upon location-specific ATC operational and safety requirements.

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You may fly without ADSB under the Class B or Class C shelf provided you remain outside of any Mode C veil. §91.225 tells you where you cannot fly. It says you cannot fly within the lateral boundaries of the Class B or C airspace or above the airspace.

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However, if you wish to operate in class A, B, or C airspace, or at an altitude of over 10,000' MSL, or within a 30 nautical mile radius of the primary airport in class B airspace, you will need a transponder and altitude encoder (commonly referred to as mode C).

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Such operations shall comply with paragraph (a) of this section. (c) No person may operate an aircraft in the airspace underlying a Class B airspace area designated for an airport or in a VFR corridor designated through such a Class B airspace area, at an indicated airspeed of more than 200 knots (230 mph).

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The 250 KIAS maximum airspeed below 10,000 feet MSL was a rule of flight that was introduced a number of years ago to address the bird strike hazard of modern high-speed aircraft.

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You must receive official clearance. Also, pilots must hold a minimum of a private pilot certification to enter Class B airspace. Sport pilots, recreational pilots, and student pilots are not authorized to operate in Class B airspace.

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Class B Airspace Altitude In some high-altitude airports like Denver, the Class B ceiling extends up to 12,000 feet MSL. Atlanta is another example of an irregular Class B airspace ceiling altitude. Due to the high volume of air traffic, the Class B ceiling in Atlanta reaches up to 12,500 feet MSL.

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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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Class B Airspace, indicated by a solid blue line. Class B airspace is shown with a solid blue line around major airports in circles radiating outward.

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The hazards and effects of landing an aircraft on a runway without clearance are essentially the same as for a runway incursion. Increased risk of collision for one or more aircraft on the ground is the predominant concern.

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