(CNN) – jazz of multivitamins, bar of soap, perfume-free laundry detergent, latest best seller, NASCAR tickets or whatever Gwyneth Paltrow sells on her website will come after you to make sure you used your purchases.
But the world's biggest airlines might.
They require that you fly all the flights. They might take away your frequent miles, or even sue you.
"So, if I don't eat my steak at Peter Luger's, are they going to sue me now?" Delta Air Lines frequent flier Billy Stocklin says. "It's my ticket and seat."
] "Hidden city ticketing" is a longtime, rule-breaking fliers. One of the world's largest airlines is now taking the stage.
Lufthansa is suing a passenger who is skipped out of the last leg.
1; with only $ 350.
If you get off the plane in Los Angeles – throwing away the second flight from Los Angeles to Reno – you'll get to La La Land at a "discount."
Hidden city ticketing may have been for a 20-something named Aktarer Zaman. Zaman launched Skiplagged, the price of their compliant airlines.
"The Fares tend to be "She says," she says. "For example, fortress hubs such as Frankfurt for Lufthansa, Atlanta for Delta, Dallas / Fort Worth for American and Newark for United Kingdom."
"Flights says Jeffrey C. Price, Owner of Leading Edge Strategies t and an Aviation Professor at Metropolitan State University Denver.
"Cities where there is not a high demand," says Price.
Lufthansa, which made $ 41.5 billion for the year. While he's fighting back, others may not be able to finance a major airline.
Lufthansa spokesman Tal Muscal declined to comment, citing ongoing litigation.
The airline alleges that in Oslo to Seattle with a layover in Frankfurt. On the return trip, the customer got off in Frankfurt, did not fly to Oslo and booked a separate flight from Frankfurt to Berlin.
"If you are not using a second flight," we will recalculate the fare according to your altered routing, "reads the Lufthansa contract.
"The fare will be determined which you would have had to pay for your actual routing."
Even if the airline loses on appeal, it's sending a message to fliers.
At the same time, the highlights of airlines can charge customers more to fly less.
"It's easy to understand why some travelers are tempted to risk it, especially if you live in a city," Wilson says.
But she warns that you could be penalized if you're caught.