Aero Linx: The International Council of the Aeronautical Sciences
The ICAS organisation consists of two corporate bodies, the Council (being the assembly of Member Societies), having all authority other than the authority given to others according to the law or these Statutes and the Executive Committee, responsible for the management of ICAS. The Council appoints the Executive Committee for a two year period.
Air Traffic Control Clearance [ICAO]
Authorization for an aircraft to proceed under conditions specified by an air traffic control unit.
Note 1: For convenience, the term air traffic control clearance is frequently abbreviated to clearance when used in appropriate contexts.
Note 2: The abbreviated term clearance may be prefixed by the words taxi, takeoff, departure, en route, approach or landing to indicate the particular portion of flight to which the air traffic control clearance relates.
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