Hundreds of flights were canceled in Canada on Sunday after flight attendants at the country's second-largest airline, WestJet, went on strike.

Flight attendants at WestJet, Canada's second-largest airline, have threatened to strike over unpaid work.

A work stoppage looms for 4,400 flight attendants at Canada's second-largest air carrier after their union issued a 72-hour strike notice early Thursday morning. WestJet responded…