It’s Easiest to Use Your Frequent Flier Miles on This Airline

Anyone who has tried to book a free flight using frequent flier rewards knows it can be a frustrating process. Jay Sorensen — president of IdeaWorks, which conducted the survey — tells CNBC. The survey found that overall, airlines offered reward seats on 72.4 percent of the flights checked — a drop from last year’s 76.6 percent.