Despite the initial attempt by Air Canada to return to regular service as early as this morning, the move by the union representing striking flight attendants to defy the federal back-to-work order handed down over the weekend means travellers may be facing “another chaotic day,” Canadian Press reports.

The airline said the first flights will be cancelled Thursday, with more on Friday and a complete cessation of flying by Air Canada and Air Canada Rouge by the weekend

After months of stalled negotiations, 10,000 Air Canada flight attendants walked off the job early Saturday morning. The federal government stepped in hours later to order binding arbitration, forcing an end to the strike — or so they thought.