The airline said operations will gradually restart after a deal was reached with the union, ending a strike that caused hundreds of flight cancellations and hit 500,000 customers.

The strike, which ended on Tuesday, focused attention on why many airlines don’t start paying flight attendants until the plane doors are shut.

Air Canada and the union representing 10,000 flight attendants resumed talks late Monday for the first time since the strike began over the weekend. The strike is affecting about 130,000 travelers a day at the peak of the summer travel season.