How high does Class B airspace extend?

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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In the 1900s, Hungarian physicist Theodore von Kármán determined the boundary to be around 50 miles up, or roughly 80 kilometers above sea level. Today, though, the Kármán line is set at what NOAA calls “an imaginary boundary” that's 62 miles up, or roughly a hundred kilometers above sea level.

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Upper Class E airspace operations refer to those that take place over 60,000 feet above mean sea level (MSL) in the National Airspace System (NAS). Operations in upper Class E airspace have historically been limited due to the challenges faced by conventional fixed wing aircraft in reduced atmospheric density.

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As the federal authority over operations in all airspace and the regulating authority over operations, the FAA will ensure that the ETM cooperative vision aligns with agency goals and meets the requirements for safe and efficient operations.

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There is no existing mechanism for the FAA to monitor if there are drone pilots, licensed or otherwise, who will fly above this altitude limit. That is well and fine until you get into a close encounter with a manned aircraft, for which you could be facing heavy penalties if the FAA can identify you as the drone pilot.

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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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The outer limits of the airspace will not exceed a 30 NM radius from the primary airport. This 30 NM radius will generally be divided into three concentric circles: an inner 10 NM radius, a middle 20 NM radius, and an outer 30 NM radius.

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All airspace above FL 600 is Class E airspace. Uncontrolled airspace or Class G airspace is the portion of the airspace that has not been designated as Class A, B, C, D, or E. It is therefore designated uncontrolled airspace. Class G airspace extends from the surface to the base of the overlying Class E airspace.

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How and when can drone pilots use LAANC ? Drone pilots planning to fly under 400 feet in controlled airspace around airports must receive an airspace authorization from the FAA before they fly. LAANC is available to pilots operating under the Small UAS Rule Part 107 or under the exception for Recreational Flyers.

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Class B airspace is the most controlled airspace in the United States. It is located around major airports and has strict restrictions on drone flying. In general, it is prohibited to fly a drone in Class B airspace without permission from the FAA.

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Ultimately, the 400-foot altitude limit was put in place for the sake of airspace safety. The airspace beyond 400 feet is large and the chances of running into another aircraft are astronomically low, but the potential consequence of a drone crashing into a manned aircraft can be disastrous.

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Different airplanes have different maximum altitudes, depending on their construction. For example, the Airbus A320 has a maximum altitude of 39,000 feet (11,900m) and the Boeing 747 45,000 feet (13,700m).

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