The Norwegian Air Shuttle flight had taken off from the capital Oslo with more than 80 plumbing industry workers bound for a trade event in Germany.
But just minutes later an announcement was made that the flight would need to turn back after a crew member noticed a problem with the plane's toilets.
One of the passengers was Frank Olsen, the CEO of plumbing company Rorkjop.
The flight was already more than 30 minutes behind schedule, and was forced to circle in the air to use up fuel until it was light enough to land again.
In all the flight lasted about an hour, but luckily no-one needed to use the facilities in that time.
While the irony was not lost on Mr Olsen, he said it would have been a bit risky for any of the plumbers to try and fix the problem.
"We'd have gladly fixed the toilets, but it must unfortunately be done from the outside, and we didn't want to take a chance on sending out a plumber at 10,000 meters altitude," he said.
A spokesperson for the budget airliner said the aircraft was repaired and continued on a flight later the same day.
Mr Olsen and his staffers also managed to catch a later flight.
"Even the flight attendant came and told me that she have never done a U-turn with that many passengers smiling on board," he said.
"We are still smiling."
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