The Wall Street Journal - A new survey from IdeaWorksCompany ranked the world's 25 largest frequent-flier programs. Who came out on top? WSJ 'Middle Seat' columnist Scott McCartney discusses the results. The Switchfly Reward Seat Availability Survey is based upon 7,640 booking queries made by the IdeaWorksCompany at the websites of 25 frequent flier programs during March 2014. Travel dates spanned June through October 2014, with top routes for each carrier checked to assess “saver style” reward seat availability.