Thanks. I used Delta. Southwest has no value to me. It doesn't go where I do. I have never flown it ever. I know I am not far from BWI and PHL where I believe they exist, but I hardly ever fly domestic. Delta is crummy but at least I can buy gift cards which work(so far)You probably figured this out but TPG has a good posting on what triggers the credit.
If you have an Amex card with an airline fee credit, you can buy gift cards with certain airlines to use the credit toward airfare.thepointsguy.com
It looks like your best bet is with southwest. (although American and Delta should work too (some DP's show not the full amount reimbursed with these two)