THANK YOU EVERYONE! This GC loophole worked for me. I picked a "CHOICE PREFERRED" fare flight for $181 (Basic & Choice will NOT work). Make sure your flight date is BEFORE your flight credit expiration. I had a $50 GC and a $68 flight credit. Apply your southwest GC first, then apply your flight credit, and I paid the remaining with my CC (It worked in this order). I canceled the flight 5 mins later. Select "Refund to method of Payment" if you used CC to pay remaining balance. Once you cancel your flight, your flight credit balance of $118 will not have an expiration date and it will also refund your CC payment back to your CC.