If I have a round trip ticket, can I change the departure city for just the outbound trip (e.g., if I have a round trip ticket from Denver to Chicago and returning from Chicago back to Denver, can I change the outbound flight into Los Angeles to Chicago, keeping the returning Chicago to Denver flight)? If so, what is the price difference? Is it the difference between the original round trip ticket and a one-way ticket from LA to Chicago? Or would I need to buy a second one-way ticket for the return trip from Chicago to Denver?
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