Build an App to Find Cheap Airfares

Let's talk about mistakes. They're part of life; everyone makes them—even airlines.

In 2014, I happened to be reading my Twitter feed one afternoon when one of the accounts I follow tweeted that a major US airline had fares to Europe that were significantly below what would be expected. At the time, the cheapest fare from New York to Vienna was around $800, but the advertised fares for a select number of dates were between $350 and $450. This seemed too good to be true. But it wasn't. I had lucked upon what's known in the industry as a mistake fare.

In the super-secretive society of travel hackers and mileage junkies, it's well-known that airlines occasionally—and accidentally—post fares that exclude fuel ...

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