The Canadian Union of Public Employees (CUPE), the union for Air Canada's 10,000+ flight attendants, issued a 72-hour strike notice meaning that flight attendants can walk off the job as early as Saturday at 12:58 a.m. ET.
In response, Air Canada will begin cancelling flights on Thursday before a full cancellation of all flights by Air Canada and Air Canada Rouge by the weekend, potentially affecting 130,000 customers a day.
Air Canada Express flights operated by Jazz and PAL Airlines are expected to continue operating as normal.
Please see this link for more information: https://www.cbc.ca/news/business/air-canada-union-strike-notice-1.7607154