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IATA airport codes are three-letter identifiers that link airports to their cities and are used in tickets, baggage tags, and flight information. RIX is the code assigned to Riga, the capital of Latvia, specifically for Riga International Airport. The code is shaped to reflect the airport or city name, which is why Riga uses RIX. For contrast, Dublin’s code is DUB, Oslo’s code is OSL, and Warsaw’s code is WAW, showing how different cities have different three-letter tags. So RIX corresponds to Riga.