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 Madison Truax Field Airport flight would often be abbreviated as a MSN flight.
If you book a flight to Madison, you will be flying into Truax Field, which is the city’s only airport. Madison Truax Field (MSN) is located 8.7 km from the centre of Madison.
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