Kiwi.com. They said they would work with both carriers in trip to get me a refund or flight credit. After a full year and half they were NOT able to get me a rightful refund from AA! They literally stole 600 USD from me outright I cannot do anything about it. I called AA and they said I would've gotten me a full refund if I booked with them and Southwest never got my cancelation from Kiwi so I was put as a "No Show" and not eligible for flight credit. Absolutely the worst company experience, I really hope they got out of business soon.