MSN 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 MSN flight refers to a flight to Madison Truax Field Airport.
For a flight to Madison, you will be flying into Truax Field. Madison Truax Field (MSN) is just 8.7 km from the centre of the city.
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