The Canadian Union of Public Employees (CUPE) said in a statement early Tuesday that a tentative agreement has been reached to end the contract dispute between flight attendants and Air Canada.

The union representing Air Canada’s 10,000 flight attendants says its members will return to work after reaching a tentative agreement with the airline, effectively ending a disruptive strike that grounded thousands of flights and stranded passengers across the country.

While Air Canada says it would not negotiate with the union until flight attendants return to work, CUPE says the two sides were in discussions Monday night with a mediator.