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<http://schema.org/text>
"These are just IATA (International Air Transport Association) codes. They are used in aviation to identify and differentiate airports. That’s why a Londonderry Eglinton Airport to Cancun Airport flight would often be abbreviated as a LDY to CUN flight. Tulum Intl Airport (TQO), Cozumel Airport (CZM) are other airports near this flight route and their unique identifiers/IATA codes."
<https://www.cheapflights.co.uk/flights/Tulum/Derry/>