Southwest Airlines' cautious entry in the Minneapolis-St. Paul market next March has experts questioning whether the discount carrier has bigger things in store. Initially, the airline will fly only from MSP to Chicago Midway, where passengers can connect to 220 daily Southwest flights to 47 destinations. But observers note that Southwest also offered limited service when it first moved into Denver International Airport in 2006, only to expand aggressively once a beachhead had been established.

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