The airlines industry is a highly competitive one, and if you run a travel service that offers online bookings, then you need to do all that you can to ensure that your internet airlines ticketing business makes you money. In order to achieve this objective, you need traffic. There is only so much traffic you can get from PPC and social media. Time and money are serious constraints, and many small players find themselves up against established players in the airlines niche. Indeed, many airlines run their own affiliate programs offering lucrative commissions.