By Allison Lampert and Wa Lone

MONTREAL/TORONTO (Reuters) -Air Canada's unionized flight attendants have reached an agreement with the country's largest carrier on Tuesday, ending the first strike by its cabin crew in 40 years that had upended travel plans for hundreds of thousands of passengers.

The airline said it would gradually resume operations and a full restoration may require a week or more, while the union said it has completed mediation with the airline and its low-cost affiliate Air Canada Rouge.

"The Strike has ended. We have a tentative agreement we will bring forward to you," the Canadian Union of Public Employees said in a Facebook post, as the strike entered its fourth day.

The carrier had earlier offered a 38% increase in total compensation for flight attendants over f

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