Boeing’s grounded airliners are likely to be parked longer now that European and Canadian regulators plan to conduct their own reviews of changes the company is making after two of the jets crashed.

The Europeans and Canadians want to do more than simply take the U.S. Federal Aviation Administration’s word that alterations to a key flight-control system will make the 737 Max safer. Those reviews scramble an ambitious schedule set by Boeing and could undercut the FAA’s reputation around the world.

Read more at Associated Press News.