This is just an IATA (International Air Transport Association) code. IATA codes are used in aviation to identify and differentiate airports. That’s why a Quito Mariscal Sucr Airport flight would often be abbreviated as a UIO flight.
Booking a flight to Quito Mariscal Sucr (UIO) is your only option if you intend on flying to Quito. It is only a 22.5 km journey from Mariscal Sucr to Quito’s city centre.
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