It could be another chaotic day for travellers as a labour dispute continues between Air Canada and the union representing its flight attendants.

Air Canada says it has suspended plans to resume limited operations after the union representing the airline's flight attendants said Sunday it will defy a federal back-to-work order for binding arbitration to end the work stoppage.

Air Canada flight attendants said on Sunday they will remain on strike and challenge a return-to-work order they called unconstitutional, defying a government decision to force them back to their duties by 2 p.