The union representing 10,000 Air Canada flight attendants says it's reached a tentative agreement with the carrier and their strike, which had entered its fourth day, is over.

The airline said that it would gradually restart operations Tuesday but that a return to "full restoration may require a week or more."

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.