Passage: We were really excited about going to Disney World , but we also wanted to discover the world 's best sea shells , which were a few hours away on Sanibel Island . Since my wife and I lived in New York , we knew that driving there would be difficult , so we decided to fly . Making a reservation is always difficult since you get severely penalized for changing or canceling your plans , so we were careful to make sure our work and families would be okay with our plans before booking . One morning , a price alert came through indicating that the price dropped and that we could save a lot of money if we acted quickly . We logged onto the Web site and confirmed our purchase before those unpredictable machines could change their minds and raise the prices again . Florida here we come ! Question: What did they start tracking? Option1: Flight Prices. Option2: Police cars.
Flight Prices.