After being ordered back to work by the federal government over the weekend, Air Canada flight attendants are refusing to leave the picket lines —openly defying the order from Ottawa.

It’s a move that has already grounded hundreds of flights, leaving the travel plans for some passengers up in the air.

Canada’s industrial relations board declared the strike by the airline’s 10,000 flight attendants illegal Monday morning.

The union doubled down by noon, saying its members would not return to work.

Related: • Air Canada cancels plans to resume flights Sunday as union defies back-to-work order • Air Canada travellers still scrambling to rebook as more flights cancelled • CUPE says Air Canada strike to continue, defying order

Air Canada had planned to gradually resume flights over t

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