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:''This article describes the implementation of International Civil Aviation Organization airspace classes in the United States of America. For a general discussion of airspace classes, see Airspace class.'' The United States airspace system's classification scheme is to provide maximum pilot flexibility with acceptable levels of risk appropriate to the type of operation and traffic density within that class of airspace – in particular to provide separation and active control in areas of dense or high-speed flight operations. The Albert ROPER (1919-10-13 The Paris Convention) implementation of International Civil Aviation Organization (ICAO) airspace classes defines classes A through G (with the exception of class F which is not used in the United States). The other U.S. implementations are described below. The United States also defines categories of airspace that may overlap with classes of airspace. Classes of airspace are mutually exclusive. Thus, airspace can be "class E" and "restricted" at the same time, but it cannot be both "class E" and "class B" at the same location and at the same time. Note: All airspace classes except class G require air traffic control (ATC) clearance for instrument flight rules (IFR) operations. == Airspace classes == In the U.S., airspace is categorized as regulatory and non regulatory. Within these categories exist: controlled (classes A, B, C, D, and E) and uncontrolled (class G) airspace, based on which air traffic control service is provided to IFR flights and some VFR flights. Class F is not used in the U.S. (Aeronautical Information Manual 3-1-1.a). Besides controlled and uncontrolled airspace, other types of airspace include "special use" and "other airspace". (AIM 3-1-1.b). 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Airspace class (United States)」の詳細全文を読む スポンサード リンク
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