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2. Aviation call signs - Wikipedia

   en.wikipedia.org/wiki/Aviation_call_signs

   Aircraft registration numbers internationally follow the pattern of a country prefix, followed by a unique identifier made up of letters and numbers. For example, an aircraft registered as N978CP conducting a general aviation flight would use the call sign November-niner-seven-eight-Charlie-Papa.

3. Call sign - Wikipedia

   en.wikipedia.org/wiki/Call_sign

   Russian nuclear icebreaker Arktika with call sign UKTY. Merchant and naval vessels are assigned call signs by their national licensing authorities. In the case of states such as Liberia or Panama, which are flags of convenience for ship registration, call signs for larger vessels consist of the national prefix plus three letters (for example, 3LXY, and sometimes followed by a number, e.g. 3LXY2).

4. Call signs in the United States - Wikipedia

   en.wikipedia.org/wiki/Call_signs_in_the_United...

   More letters were added as the number of stations grew. Effective October 1, 1928, the amateur and Special Land stations were "internationalized", with stations adding an initial "W" (for continental) or "K" (for territorial) ahead of their call signs' district number. [32] In later years a greater variety of amateur call signs would be added.

5. USAAF unit identification aircraft markings - Wikipedia

   en.wikipedia.org/wiki/USAAF_unit_identification...

   A letter denoting the group was painted on the upper third of the tail fin, with a square symbol in the center, and an aircraft identifier, known as the "victor number," in the lower third. Aircraft commonly used their tail identifiers as radio voice calls ( call signs ), i.e. Lucky Irish (serial 42-24622) of the 870th Bomb Squadron, 497th Bomb ...

6. Amateur radio call signs - Wikipedia

   en.wikipedia.org/wiki/Amateur_radio_call_signs

   A call sign composed of a letter, two digits, and one-letter is always a 2×1 call sign, meaning it has a letter-digit prefix and a single-letter suffix. for all letter-digit-digit-letter callsigns, if the first character is other than B, F, G, I, K, M, N, R, or W then it is a 2×1 call sign; PNSS, 1×2 call sign prefix always a letter, suffix ...

7. Spacecraft call signs - Wikipedia

   en.wikipedia.org/wiki/Spacecraft_call_signs

   Spacecraft call signs are radio call signs used for communication in crewed spaceflight. These are not formalized or regulated to the same degree as other equivalent forms of transportation, like aircraft. The three nations currently launching crewed space missions use different methods to identify the ground and space radio stations; the ...