Dubai — The US aviation regulator will ensure certification of Boeing's 777X wide-body jet is conducted rigorously, the agency's head said on Wednesday while reaffirming that its review of the grounded 737 Max will not be rushed.

Problems with a number of aircraft models have led some airlines to accuse plane and engine makers of overpromising on performance capabilities, while the grounding of Boeing's 737 Max after two fatal crashes has increased scrutiny of testing and certification...

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