What airspace is Class A?

Class A airspace generally begins from 18,000 feet mean sea level up to and including 60,000 feet. Operations in Class A are generally conducted under Instrument Flight Rules and primarily used by higher performance aircraft, airline and cargo operators, etc.



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There are six classifications of airspace in the United States; A, B, C, D, E, and G. Class A is the most restrictive and Class G the least restrictive. They can be categorized as: Class A – 18,000 feet and higher above mean sea level (MSL). Class B – Airspace around the 40 most congested airports in the country.

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The Class A, or Class Alpha category of controlled airspace is the high-altitude enroute airspace for jet and turboprop aircraft. It is the most restrictive airspace category with numerous entry and operational requirements for both pilots and aircraft.

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Class A airspace generally begins from 18,000 feet mean sea level up to and including 60,000 feet. Operations in Class A are generally conducted under Instrument Flight Rules and primarily used by higher performance aircraft, airline and cargo operators, etc.

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Class A airspace begins at 18,000 feet above sea level known as mean sea level, or msl, and goes up to 60,000 feet msl. This airspace covers both the 48 contiguous states and Alaska and extends offshore 12 nautical miles.

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You should advise ATC before any altitude change when operating VFR-on-top. This ensures ATC can provide accurate traffic information and separation. VFR-on-top is not permitted in Class A airspace.

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There's one more thing to keep in mind when you're operating in Class B airspace: in general, you need to be at least a private pilot to enter the airspace. Student, sport and recreational pilots can enter specific Class B airspaces, but only after they receive training and an endorsement from an instructor.

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Class B airspace supports both Instrument Flight Rules (IFR) and Visual Flight Rules (VFR) operations within. Class Bravo Airspace surrounds those airports that have at least an operational Air Traffic Control Tower (ATCT), and Terminal Radar Approach Controls (TRACON)

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Can we fly over it? Technically yes, BUT it's still a very bad idea because a motor out would force you to descend through the Class C airspace. We CAN'T fly here without special permission from ATC. Permission should be obtained in advance by telephone (some controllers will accept a radio call).

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Flight Rules. Over the high seas, the lower limit of all NAT oceanic control areas is FL55. There is no upper limit. Airspace at and above FL55 is Class A controlled airspace and below FL55 it is Class G uncontrolled airspace.

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There are two categories of airspace or airspace areas: Regulatory (Class A, B, C, D, and E airspace areas, restricted and prohibited areas). Nonregulatory (military operations areas [MOA], warning areas, alert areas, controlled firing areas [CFA], and national security areas [NSA]).

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Class Charlie or Class C airspace is a busy category of controlled airspace found near mid-size airports that service both general aviation and airline traffic. The primary airport in a Class C airspace has both an operational Air Traffic Control Tower (ATCT) as well as Terminal Radar Approach Controls (TRACON).

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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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