Non-regulatory special use airspace consists of warning areas, military operating areas, alert areas, and controlled firing areas.
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The two categories of airspace are: regulatory and nonregulatory. Within these two categories, there are four types: controlled, uncontrolled, special use, and other airspace.
For flights near airports in uncontrolled airspace that remain under 400' above the ground, prior authorization is not required. When flying in these areas, remote pilots and recreational flyers must be aware of and avoid traffic patterns and takeoff and landing areas.
(a) No person may operate an airplane under VFR in uncontrolled airspace when the ceiling is less than 1,000 feet unless flight visibility is at least 2 miles. (2) At night—1 mile.
In theory, a pilot can operate in sub-VMC conditions under IFR without an ATC clearance in Class G airspace. However, to enter or operate in controlled airspace under IFR, an ATC clearance is required.
Special use airspace (SUA) consists of that airspace wherein activities must be confined because of their nature, or wherein limitations are imposed upon aircraft operations that are not a part of those activities, or both.
A generic term that covers the different classification of airspace (Class A, Class B, Class C, Class D, and Class E airspace) and defined dimensions within which air traffic control service is provided to IFR flights and to VFR flights in accordance with the airspace classification.
Class F airspace is technically designated as uncontrolled, but you can sometimes get ATC clearances as found in controlled airspace. ATC clearances in Class F are advisory only, meaning that you don't legally have to follow ATC directives, and the final responsibility rests with the pilot in command.
Violating prohibited airspace established for national security purposes may result in military interception and/or the possibility of an attack upon the violating aircraft, or if this is avoided then large fines and jail time are often incurred.
For the purpose of clarification: Class A airspace is more restrictive than Class B, Class C, Class D, Class E, or Class G airspace. Class B airspace is more restrictive than Class C, Class D, Class E, or Class G airspace.