I used to book air flights through Skiplagged.com and was earning credits through their "rewards program" in the process. However, after trying to redeem these credits to utilize for my next flight, I would always get an email from the airlines telling me that there was something with wrong my payment. Mind you, this happened 3 separate times and not once did it ever work. Although, they would reimbursed me back with credits, I felt that they were always laughing at me as they knew it wasn't going to work. AVOID SCAM!