Canadian regulators order union leaders to end Air Canada's work stoppage on Monday, while employees remain defiant.

The airline said it expected to resume some flight Monday night but the flight attendant’s union for the airline said that its workers will not return, defying federal return-to-work orders. Air Canada canceled hundreds of flights over the weekend after 10,000 flight attendants defied federal return-to-work orders amid a strike over fair pay.

TORONTO (AP) — Air Canada suspended plans to restart operations Sunday after the union representing 10,000 flight attendants said it will defy a return to work order. The strike was already affecting about 130,000 travelers per day during the peak summer travel season.