IATA codes starting with the letter FListed are cities with an international, regional, or municipal airport and some cities with an airport for only General Aviation (GA), which are usually not served by commercial airlines.
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For instance, an Aerodrome with a reference code 4E can accommodate aircraft with a “Reference Field Length” of 1800m and above and a wingspan up to 65m.
With the rapid growth in the aviation industry, in 1947, the identifiers expanded to three letters and LA received an extra letter to become LAX. The letter X does not otherwise have any specific meaning in this identifier.
ICAO code consists of 4 letters. Certain classifications among countries and regions are used in creating these codes. The first letter stands for the region in which the airport is located, the second is for the country. The other two letters are generally given in order.
the letter ''K'' was simply assigned to the contiguous US by ICAO, in order to have a system with unique identifiers for world-wide use, instead of trying to adapt local system to match. The IATA codes had been in use already and possible duplicates could not be excluded.
According to Airfarewatchdog, in the 1930s, it was important to know whether or not an airport had a weather/radio station located on its premises, for safety and landing reasons. If it did, the letter Y for yes was added in front of the existing radio call sign.
The IATA code is for travel agents and the airlines. Originally Canadian airports had a two letter ID, which was enough when there were only a few airports. As air travel became common, Canadian airports began to use 3 and now 4-letter codes, typically begin with the letter “C”.
Cities with multiple commercial airports. In large metropolitan areas, airport codes are often named after the airport itself instead of the city it serves, while another code is reserved which refers to the city itself which can be used to search for flights to any of its airports.
Los Angeles International Airport is the main international airport in California. The airport is more commonly referred to by its code, LAX, and is one of the busiest airports in the world.