EU transport officials say they will work with other regulators on approving new software for the Boeing 737 Max.
But they say they reserve the right to take their own decision on when to return the jet to service.
It was grounded globally in March after two crashes led to concerns over its new anti-stall MCAS sotfware.
Global airlines are worried that splits between regulators over the plane’s safety could further damage the industry and hit passenger confidence.
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The decision by the European Union, China, and others to ground the Max – before the US did so – created an unusual split in the global regulatory system.