TORONTO — Air Canada and the union representing its customer service agents, who work at airports and call centres, have begun contract talks. Unifor says it has opened collective bargaining on behalf of its nearly 6,000 members working at Air Canada locations across the country. Unifor’s current contract with Air Canada expires on Feb. 28. Air Canada spokesperson Peter Fitzpatrick said the airline wants to reach a negotiated agreement that recognizes the important contributions of the employees. The contract talks follow a labour dispute between Air Canada and its flight attendants last year.