Australian airline Qantas has grounded one of its Boeing 737 NG planes after discovering “cracking” in one section.
The carrier said several airlines were inspecting their 737 NG fleets after Boeing revealed an area near the wing may be prone to cracking.
News agency AFP reported up to 50 planes globally had been grounded due to the issue.
Qantas said: “Even when a crack is present, it does not immediately compromise the safety of the aircraft.
“We would never operate an aircraft unless it was completely safe to do so.”
Boeing said cracks had been found in the “pickle fork” – a section of the plane which helps attach the wing.
Last month, US regulators ordered checks of all 737 NG planes which had undertaken more than 30,000 flights.