WestJet Airlines, Canada's No. 2 carrier, said it canceled 393 flights from Thursday through Sunday and warned that number could grow after a union representing maintenance engineers went on strike despite a government order to stop a walkout.

WestJet Airlines, Canada’s No. 2 carrier, said it canceled 393 flights from Thursday through Sunday and warned that number could grow after a union representing maintenance engineers went on strike despite a government order to stop a walkout.