One of the world's largest airline companies, Lufthansa has been given permission to appeal after an original ruling found in the passenger's favour, it has been reported.
The hack took advantage of the airlines' ticketing system, whereby multi-stop journeys are typically cheaper than non-stop flights.
In an interesting twist, Lufthansa has filed a lawsuit against a passenger for leveraging a ploy that seasoned flyers use to cop cheaper fares.
Hidden city ticketing frustrates airlines, and Lufthansa reportedly sought around $US2,385 ($3,362) in damages from the passenger, claiming he violated the airline's terms of service.More news: Tencent invest $150m in Reddit pushing its value to $3b
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The airline hack is known as the "hidden city" scheme, in which a person books a flight with a layover, and then intentionally stays at the layover city instead of continuing to the planned final destination.
Lufthansa is set to take legal action against a passenger who did not complete the final leg of a flight in a crackdown on "tariff abuse".
In the German case, an unnamed male passenger booked a round-trip Lufthansa Airlines flight from Oslo to Seattle with a layover in Frankfurt in April 2016, CNN reported, citing court documents.
Lufthansa declined Business Insider's request for comment.
Back in 2014, United Airlines and Orbitz filed a civil lawsuit last month against 22-year-old Aktarer Zaman, who founded the website Skiplagged.com, which helps travelers find cheaper flights by using the "hidden city" strategy. "We're exposing loopholes in airfare pricing to save you money".
However, that suit was thrown out by an IL judge, who said the district didn't have jurisdiction over the issue.