U.S. air-safety regulators are poised to order electrical wires relocated inside Boeing Co. 737 MAX jets in the latest complication and potential delay for their return to commercial service, according to people briefed on the deliberations.

The preliminary decision, which hasn’t been reported before, covers all of the nearly 800 MAX airliners produced so far. The decision could be affected by further internal discussions and additional data the plane maker may submit to the regulator.

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