Boeing Max Overhaul Sparks U.S.-Canada Rift Over Pilot Guidance

Canadian aviation regulators are at odds with their U.S. counterparts over guidance for pilots of the Boeing Co. 737 Max during an emergency, threatening to open a schism between nations critical to the plane’s return to service.

Canadian officials have insisted in contentious meetings that Max pilots should be instructed to disable a key warning system to avoid distraction during an emergency. Their counterparts at the U.S. Federal Aviation Administration argue that such a change would create additional risks, according to two people familiar with the discussions who asked not to be named because of their sensitivity.