Pilots do not need FCC licenses to use the radio within the United States ( pilot certificates double as FCC radio licenses ); however, other countries may require that a pilot have an FCC Restricted Radiotelephone Operator Permit ( RR ), and the aircraft radio station be licensed.
2.
In most countries, the aircraft call sign or " tail number " / " tail letters " ( also known as registration marks ) are linked to the international radio call sign allocation table and follow a convention that aircraft radio stations ( and, by extension, the aircraft itself ) receive call signs consisting of five letters.
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