While that might seem like an innocent enough act, the German airline claims that the passenger was trying to leverage the "hidden city" ticket trick, a method experienced airline passengers employ to get cheaper fares.
A Lufthansa spokesman confirmed to CTVNews.ca in a telephone interview from Frankfurt that it is pursuing payment from a traveller who, it believes, bought a ticket with no intention of flying the last segment of their trip.
As Travel + Leisure previously explained, Hidden city ticketing - otherwise known as point beyond ticketing - is when a traveler books a flight from point A to point B to point C, with point B representing a layover.
Lufthansa is suing a man who intentionally failed to board a connecting flight from Frankfurt to Oslo, but the lawsuit has nothing to do with the passenger's tardiness.
For example, you might be keen to get from Los Angeles to Houston, but a flight from LA to New Orleans with a connection in Houston happens to be cheaper than a direct flight. Lufthansa German Airline is no exception.
Skiplagging can cause delays for airlines as they wait for unaccounted-for passengers, with carriers that have flights routed through hub airports - such as Lufthansa in Frankfurt and Munich - particularly affected. So far a court has found in favour of the passenger - but now Lufthansa is appealing.
A Berlin district court reportedly dismissed the lawsuit in December, but Lufthansa told CNN it has appealed the decision.
The case was thrown out in 2015 after the judge in the Northern District Court of IL said the court didn't have jurisdiction over the case because Zaman didn't live or do business in that city.
Many carriers put it in their terms and conditions that the practice is illegal.