The casual air traveler has never had so much information at his fingertips. He sits before a battleship-worthy console of maps, prices, dates, and times; orders up grids that plot one variable against another. He is monitoring the situation. He is in conversation with his wallet, but also with his future self: Will he want to take the red-eye and leave his bags at the hotel all day' Will he want to leave the house at 4 a.m.' What's so great about Iceland, anyway' This stupendous array of choices, once reserved for professional travel agents, is emblematic of our optimized-shopping era. Consumers don't just price-shop; they scrutinize rates of change, guided by algorithms that purport to know where prices are headed. With airfares at historic highs, the sites that advise travelers whether to buy now or wait have never felt more necessary. Unfortunately, they have rarely felt less helpful. Sites such as Hopper, Kayak, and Google Flights are trained on price histories. 'They use data...
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