The Air Canada flight attendants strike started at 12:58 a.m. Eastern Time on August 16, 2025. The Canadian Union of Public Employees (CUPE) representing 10,000 flight attendants issued a 72-hour strike notice on August 13, 2025, after negotiations with Air Canada broke down. As a result, Air Canada and Air Canada Rouge suspended all their flights from the strike start date, while Air Canada Express flights operated by third parties were not affected.