NEW YORK (AP) — Flight attendants with WestJet, Canada’s second-largest airline, went on strike Sunday in a dispute over pay.

The Canadian Union of Public Employees represents the 4,400 cabin crew at the airline. It announced the strike on its Facebook page but did not provide further details. The company had canceled more than 300 flights as of early Sunday, snarling travel plans in Canada in the middle of a three-day weekend.