ITU
International Telephone Union, refers to certain HF channels.
ITW
Initial Training Wing (Ground School) ...
The aircraft registration is made up of a prefix selected from the country's callsign prefix allocated by the International Telecommunication Union (ITU) (making the registration a quick way of determining the country of origin) and the registration ...
 See also: ICAO, Power, Plane, Combi, Ident
  
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