I was just introduced to Farecast, a site that provides predictions of airline ticket prices based on a history of data. They currently only have data for 75 cities, as their database is limited.

Airline ticket prices can fluctuate wildly depending on demand for a particular date or even the day of the week you buy the ticket. Experienced travelers take advantage of these fluctuations to get the lowest price possible. With Farecast, even the novice traveler can try to get the best deal on their next flight.

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