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Which of the following airport codes corresponds to Missoula, MT?

  1. EUG

  2. MSO

  3. PDX

  4. RNO

The correct answer is: EUG

Explanation Missoula, MT's airport code is MSO, not EUG, PDX, or RNO. EUG corresponds to Eugene, OR, PDX corresponds to Portland, OR, and RNO corresponds to Reno, NV. Despite these cities also being in the western United States, they are not the same as Missoula, MT and therefore do not have the same airport code.