Aviation communications

The NATO phonetic alphabet, officially the International Radiotelephony Spelling Alphabet, is an internationally recognized set of names for the letters of the Latin alphabet and the Hindu-Arabic digits. It is most commonly used in radio communication, where the usual names of the letters are likely to be misheard. It was defined in 1955–1956 by the International Civil Aviation Organization (ICAO).

US audio equipment manufacturer and retail chain

300px|thumb|Example of an ACARS message In aviation, ACARS (; an acronym for Aircraft Communications Addressing and Reporting System) is a digital data communication system for transmission of short messages between aircraft and ground stations via airband radio or satellite. The protocol was designed by ARINC and deployed in 1978, using the Telex format. More ACARS radio stations were added subsequently by SITA.

worldwide system of aeronautical fixed circuits

In international aviation, SELCAL or SelCal is a selective-calling radio system that can alert an aircraft's crew that a ground radio station wishes to communicate with the aircraft. SELCAL uses a ground-based encoder and radio transmitter to broadcast an audio signal that is picked up by a decoder and radio receiver on an aircraft. The use of SELCAL allows an aircraft crew to be notified of incoming communications even when the aircraft's radio has been muted. Thus, crewmembers need not devote their attention to continuous radio listening.

methods of relaying information to and from aircraft