CSA Air is a cargo airline based in Kingsford, Michigan, United States.

It operates express cargo services in Michigan, Wisconsin, Indiana, South Dakota and Maine, operating 35 flights a day.

Its main base is Ford Airport in Iron Mountain, Michigan and its air traffic control call sign Iron Air is derived from that city.

All of the feeder aircraft operated in the United States are owned by FedEx and because of this all of the aircraft are in the FedEx Feeder livery.

Just like regional airlines, the contractor will operate the aircraft with their own flight number and call sign.