Southwest Airlines
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SWA has a number of good features
SWA has a number of good features like low prices - we do not pay for upgrade to sit closer to the front - and SWA does not charge for checked bags. Changes/transfers are easy and don't cost too much if you get the upgrade. I have the Rapid Rewards credit card that earns points with everything you purchased. My round-trip flight from KC to Philadelphia was purchased with points.