United Airlines and Orbitz are suing a 22-year-old website founder who has made it easier for travelers to find "hidden city" tickets, which can offer big discounts on airfares.
"Hidden city" ticketing is the practice of booking a one-way plane ticket from one city to another, and then getting off the plane on a layover before the final destination. It may seem counterintuitive, but booking the longer flight can sometimes be cheaper because of the convoluted mess that is airline pricing.
It's not illegal — but that doesn't mean airlines and booking sites want people to do it
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