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Traditionally, airline teletype technology uses Teleprinter s, which are essentially electro-mechanical typewriters that can communicate type messages from point to point through simple electric Communications Channel s, often just pairs of wires. The most modern form of these devices are fully electronic and use a screen, instead of a printer. HISTORICAL DEVELOPMENT The airline industry has been making use of teletype technology since the early 1930s . It was during this time period that the first federal teletype stystem was introduced in the United States to allow weather and flight information to be exchanged between air traffic facilities. In , KLM , Sabena , Swissair , TWA , British European Airways Corporation , British Overseas Airways Corporation , British South American Airways , Swedish A. G. Aerotransport , Danish Det Danske Luftfartselskab A/S , and Norwegian Det Norske Luftfartselskap . Their aim was to enable airlines to be able to use the existing communications facilities in the most efficient and cost-effective manner. Morse Code was the general means of relaying information between air communications stations prior to World War II . Generally, it was only necessary to relay a message between one or two stations. After World War II, there was an increase in the number of commercial aircraft operating, and these aircraft were capable of flying greater distances than in the past. As a result, the Aeronautical Fixed Telecommunications Network (AFTN) was implemented worldwide as a means of relaying the necessary air traffic communications, sometimes through the use of Radio Teletype . Today, the airline industry continues to use teletype messages over SITA or AFTN networks as a medium for communicating via messages. Most teletype messages are machine-generated by automatic processes. IATA standardise Teletype Message Format s throughout the airline industry. AN EXAMPLE OF A TTY MESSAGE (SITA FORMAT) QD AAAABBB. - SITA message to AAAABBB (priority=deferred) XXXXYYY 111301 - from (origin code + timestamp) ASM - SITA type (keyword). Identifies type of message UTC - Time mode ( Coordinated Universal Time ). UTC or LOCAL 27SEP03899E001/TSTF DL Y - Message Reference line NEW - ASM subtype (Action Identifier) BA667/13APRJ 319 C1M25VVA4C26 - Flight and date of flight; fleet & equipment information LHR1340 BCN1610 - Station/time for depart & arrival LHRQQQ 99/1 - Route information. 99 is the passenger departure terminal code QQQBCN 98/A - Route information. 98 is the passenger arrival terminal code QQQQQQ 906/PAYDIV B - Route information. LHRQQQ 999/1 - Route information. 999 is the aircaft arrival terminal code QQQBCN 998/A - Route information. 998 is the aircaft departure terminal code SI - Other supplementary information (free text) SITA Teletype messages often have a 7 character address whereas an AFTN Teletype message always has an 8-character address. |
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