If the airport had a weather station, authorities added a Y to the front of the code, meaning Yes to indicate it had a weather station or some other letter to indicate it did not.
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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.
When Canada started assigning three letter codes to airports, very few foreign airports began with “Y”, so Canada put a “Y” in front of each nearby train station code to create the airport code and to differentiate it from U.S. airports.
YVR is the IATA code for the Vancouver International Airport. The initial Y is a big clue that it's an IATA code for a Canadian airport. Presumably people are abbreviating the city to the code associated with that airport.
This system became unmanageable for cities and towns without an NWS identifier, and the use of two letters allowed only a few hundred combinations; a three-letter system of airport codes was implemented. This system allowed for 17,576 permutations, assuming all letters can be used in conjunction with each other.
Atlanta Hartsfield-Jackson International Airport remains the busiest airport in the world with 5.2 million seats in September 2023. The composition of the Global Top 10 Busiest Airports is also the same as last month but there are a few changes to the rankings.
Codes beginning with Y were reserved for Canada and, in the case of Montréal-Trudeau, the remaining two letters – U and L – correspond to the frequency emitted by the radio beacon in Kirkland, near Dorval. Thus, the code indicates that the airport is in Canada, near the Kirkland beacon.
'London's largest airport, Heathrow, is hemmed in by the suburbs and limited to just two runways,' he explains. 'Because it can't expand, the demand for air travel is met by smaller, single-runway airports around the South-East: Gatwick, Stansted, Luton and Southend.
In many cultures, the number 13 is associated with bad luck, which is why many airlines prefer to avoid igniting the superstitions of their customers and have opted to remove the number from there seating plans.
The states of Hawaii and Alaska append the letter “P” to indicate that they are in the ICAO pacific region. Anchorage is PANC in the ICAO system and Honolulu is PHNL.
ORD – Chicago O'Hare“ORD” is a nod to the airfield's history, which started its life as Orchard Field Airport (OrchaRD) in 1945, at the site where Douglas Corporation had a wartime aircraft assembly plant. That name was short-lived. In 1949 the airport was renamed for Lt. Cmdr.