By Allison Lampert, Promit Mukherjee and Gertrude Chavez-Dreyfuss

MONTREAL (Reuters) -Air Canada’s fleet of hundreds of planes remained grounded on Monday morning after striking flight attendants refused a government-backed order to get back to work and called on the airline to return to the bargaining table.

The carrier, which normally carries 130,000 people daily and is part of the global Star Alliance of airlines, had planned to start ramping up operations on Sunday evening, after a labor relations board ordered the union to return to work and start binding arbitration.

The union said no, setting up an almost unprecedented standoff with the Canadian government, which had requested the back-to-work order.

The Canadian Union of Public Employees, which represents 10,000 Air Canada cabi

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