![]() That's why mathematicians use that idea as an axiom when measuring distance. This is pretty counterintuitive - the idea that taking a detour should be longer or more expensive than a straight shot is fundamentally baked into the human brain. Skiplagging creates the possibility of two passengers being seated next to each other, one having paid less for two flights than the other had paid for one. ![]() The fact that it's sometimes cheaper to book a flight from New York to London that has a stop in Amsterdam than to book a nonstop from New York to Amsterdam shows that the airlines are breaking the triangle inequality. That cost difference should be reflected in the price of tickets between the three cities.īut that's clearly not always the case, and that violation of the triangle inequality is what makes skiplagging possible. Between fuel, maintenance, and crew pay, it should cost more to fly a plane from New York to Amsterdam, followed by a leg from Amsterdam to London, than it would to fly the plane from New York to Amsterdam. We might expect airline fares to more or less follow this rule and act as a distance metric between cities. If you have a triangle, the sum of the length of any two sides of that triangle is bigger than the length of the third side. The inequality gets its name from how triangles work in classic plane geometry. One of the most basic laws of geometry is called the "triangle inequality." If you're trying to measure the distance between points, one of the basic rules is that the distance between two points has to be less than or equal to the distance from your first point to some other point and then back to your original second point. ![]() It often indicates a user profile.Īnd it's only possible because airfares don't follow one of the most intuitive rules in math. Account icon An icon in the shape of a person's head and shoulders. ![]()
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