UIO is a unique code, commonly called an IATA code, used in the aviation industry to identify airports. This code, along with many others, are defined by IATA (International Air Transport Association). A UIO flight refers to a flight to Quito Mariscal Sucr Airport.
For a flight to Quito, you will be flying into Mariscal Sucr. Quito Mariscal Sucr (UIO) is just 22.5 km from the centre of the city.
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