re: Is anyone booking flights to ATL yet?

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southwest you can cancel any time pretty much and then use the flight credit within 12 months I believe.

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Yes, I've cancelled southwest flights many times, and re used the credits. You just need to keep the original confirmation number handy (likely will be in your email).

Also I'm not 100% positive about this, but I think you have 12 months to use the credit from the date you originally booked it. Would be best to confirm this, but just giving a heads up in case someone thought they had 12 months from when they cancelled it.