If you buy airline tickets on Craigslist, you could find yourself paying for the tickets twice, thanks to this latest scam. Elliot blogs the story of a William Marleua, who who bought Southwest airline tickets from someone on Craigslist. Four months after taking the flight, a Southwest collections specialist called him and told him to pay up. Turns out the original tickets were bought using a stolen credit card, and then the real owner of the credit card disputed the charge. Here’s what Southwest said about the situation, “Southwest has never been paid for the flight Mr. Marleau took. It is our business policy to collect payment from the person who flew….It’s a difficult situation, but we cannot protect a customer who chooses to make a questionable purchase on Craigslist for a Southwest Airlines flight.”