Air Canada flight attendants waved flags and held signs reading “would you work for free?” as they picketed outside Toronto’s Pearson International Airport on Monday morning.

Air Canada suspended plans to restart operations Sunday after the union representing 10,000 flight attendants said it will defy a return to work order.

Air Canada suspended its financial guidance through year-end, citing the impact of a strike by flight attendants that has caused the airline to scrap its entire flying schedule.