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Boeing identified a software issue affecting some 737 Max aircraft that can disrupt automated vertical navigation functions following a missed approach. The company flagged the glitch to regulators and airlines, prompting scrutiny of the automated flight systems used across its Max fleet. The disclosure adds to Boeing's ongoing efforts to rebuild confidence in the 737 Max program after years of safety and manufacturing issues. It was not immediately clear how many aircraft or carriers are affected, or what remedial software update timeline Boeing plans to pursue.