You probably know what Melanie Frazier felt like when she recently tried to book a flight from Portland, Maine, to Atlanta.
She found a $257 fare — not a bad deal — but by the time she got around to booking the ticket online a few hours later, the price had risen to $441. Undeterred, she set up a fare alert through Google, and a week later, sure enough, the fare plunged to $246. “Did your great airfare suddenly disappear? Blame “dynamic pricing.””