The Canadian Press, On Tuesday September 6, 2011, 6:35 pm EDT By The Canadian Press MONTREAL - A tentative contract deal between Air Canada and the union that represents its flight dispatchers has failed to win ratification, Air Canada said Tuesday. The airline's brief statement did not disclose any other details of the vote by the 74 members of the Canadian Airline Dispatchers Association. Details of the proposed deal were not made public when the tentative agreement was announced Aug. 19. It was unclear if the union had asked for a resumption of talks or if any were planned. However, Air Canada said it remains "business as usual" for Canada's largest airline. Earlier in August, Air Canada (TSX:AC.A) announced a tentative contract with 6,800 flight attendants. The agreement follow a three-day strike by Air Canada's customer service workers in June, represented by the Canadian Auto Workers union, over key issues such as pensions and wages. The two sides came to an agreement shortly after federal Labour Minister Lisa Raitt prepared back-to-work legislation.