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Boeing's chief executive said efforts to stabilize production of the 737 Max jetliner are taking longer than the company had anticipated. The comments point to continued operational challenges at Boeing as it works to ramp up output following years of manufacturing and regulatory setbacks. The disclosure adds to scrutiny of Boeing's production recovery timeline, which has been closely watched by airlines, regulators, and investors since the company committed to a phased increase in Max output. No specific new timeline was provided for when production rates would normalize.