When Boeing began delivering its 737 Max to customers in 2017, the company believed that a key cockpit warning light was a standard feature in all the new jets.

But months after the planes were flying, company engineers realised that the warning light worked only on planes whose customers had bought a different, optional indicator.

In essence, that meant a safety feature that Boeing thought was standard was actually a premium add-on.

Boeing detailed its initial confusion about the warning light in a statement released Sunday, adding new details to what was already known about the flawed design and introduction

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