Friction between Boeing Co. and international air-safety authorities threatens a new delay in bringing the grounded 737 MAX fleet back into service, according to government and pilot union officials briefed on the matter.
The latest complication in the long-running saga, these officials said, stems from a Boeing briefing in August that was cut short by regulators from the U.S., Europe, Brazil and elsewhere, who complained that the plane maker had failed to provide technical details and answer specific questions about modifications…
