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The Missoula County Airport Authority (MCAA) owns and operates the Missoula Montana Airport (MSO). Missoula Montana Airport (MSO) is the Gateway to Western Montana. Currently five airlines serve Missoula Montana Airport: Alaska, Allegiant, American, Delta, and United. MSO serves approximately 880,000 passengers annually. Missoula Montana Airport is financially self-supporting; no local tax revenues are used for the administration, promotion, operation, or maintenance of the airport.