https://phys.org/news/2019-03-canada-boeing-max-airworthiness.html

Garneau's comments marked a break from protocol, with Canada traditionally working closely with the Federal Aviation Administration, which regulates the US commercial airline industry.

Boeing has been making software modifications to the best-selling aircraft's MCAS flight stabilization system since a Lion Air 737 MAX 8 crashed in Java Sea October 13, 2018, killing 189 people.