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While ICAO designators are used to distinguish between aircraft types and variants that have different performance characteristics affecting ATC, the codes do not differentiate between service characteristics (passenger and freight variants of the same type/series will have the same ICAO code). IATA codes are published in Appendix A of IATA's ...
ICAO codes are separate and different from IATA codes, the latter of which have three letters and are generally used for airline timetables, reservations, and baggage tags. For example, the IATA code for London's Heathrow Airport is LHR and its ICAO code is EGLL. IATA codes are used by flight-tracking services such as FlightAware.
The ICAO codes were originally based on a two-letter system and were identical to the airline codes used by IATA. After an airline joined IATA its existing ICAO two-letter code was taken over as IATA code. Because both organizations used the same code system, the current terms ICAO code and IATA code did not exist until the 1980s.
The International Air Transport Association (IATA), formed in 1945, is the association of the airline companies. The International Civil Aviation Organization (ICAO) is a body of the United Nations succeeding earlier international committees going back to 1903. These two organizations served to create regulations over airports which the ...
There are two main issues that make it difficult to have definitive data on IATA codes. Firstly, there isn't a direct one-to-one relationship between ICAO and IATA designations - for example IATA code CNJ encompasses a number of ICAO codes and, as you rightly say, purely military types don't have an IATA code at all because there is no need.
ICAO uses 4-letter airport codes (vs. IATA's 3-letter codes). The ICAO code is based on the region and country of the airport—for example, Charles de Gaulle Airport has an ICAO code of LFPG, where L indicates Southern Europe, F, France, PG, Paris de Gaulle, while Orly Airport has the code LFPO (the 3rd letter sometimes refers to the ...
IATA time zone is a country or a part of a country, where local time is the same. IATA time zone code is constructed of 2–4 characters (letters and digits) as follows: ISO 3166-1 alpha-2 country code is always used as first and second characters of time zone code. If country is not divided into separate time zones – no more characters added.
Standards And Recommended Practices (SARPs) are technical specifications adopted by the Council of ICAO in accordance with Article 37 of the Convention on International Civil Aviation in order to achieve "the highest practicable degree of uniformity in regulations, standards, procedures and organization in relation to aircraft, personnel, airways and auxiliary services in all matters in which ...