I would seriously look into small claims court. It's allegedly somewhat effective with airlines (e.g. https://www.washingtonpost.com/lifestyle/travel/small-clai

I would seriously look into small claims court. It's allegedly somewhat effective with airlines (e.g. https://www.washingtonpost.com/lifestyle/travel/small-claims-court-a-better-bet-for-stiffed-airline-travelers/2013/06/27/cf3a3410-dd04-11e2-bd83-e99e43c336ed_story.html?utm_term=.b50a6425538e https://www.washingtonpost.com/lifestyle/travel/small-claims...)