https://www.theregister.co.uk/2019/03/13/boeing_grounded_northamerica/

Canada and America have now banned Boeing 737 Max aircraft from flying anywhere over the Great White North and the Land of the FreeTM, pending the implementation of new safety measures and training programs.

This comes after several nations, from the UK to Japan, grounded the passenger jets after two Boeing 737 Max 8s crashed in the past four months, killing 346 people onboard. Boeing has promised to deliver a software update to prevent future similar tragedies – the pair of accidents have been linked to Boeing's anti-stall technology, MCAS.