A certification flight for Boeing's 737 MAX aircraft is not yet scheduled as there are still a few "issues to resolve", a top US air safety regulator said Tuesday.
The model has been grounded since March 2019 following two crashes that claimed 346 lives.
Federal Aviation Administration chief Steve Dickson said last week that a MAX certification flight could take place in a few weeks, a key step before the aircraft can return to service.
Giving an update to reporters in Singapore Tuesday, Dickson said that "we are approaching a milestone, the certification flight is the next major milestone.
"Once that is completed, I think we'll have a good bit more clarity on whether the process goes forward."
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