A new study finds the odds are stacked against consumers who try to find the best airfares online. The study was released by the Travel Technology Association, which represents online travel websites. It was authored by Yale University Professor Dr. Fiona Scott Morton. Morton says over the last year Delta Airlines (DAL) has stopped providing information on fares and schedules to smaller travel websites. She says the lack of transparency puts consumers at a disadvantage. Her study finds U.S. consumers pay an additional $6.7 billion in costs due to the lack of information. Morton says one example of this is Southwest Airlines, (LUV) which only lists information on its own website and as a result in some cases consumers actually pay higher fares for Southwest flights than other flights offered by different carriers for the same route.