As of Dec13
Air Canada will offer a daily nonstop between Montreal and Mexico City. This will complement Mexicana's daily A319 nonstop. AC will offer a PM A319.
Furthermore, Air Canada will introduce a 2nd daily nonstop A319 to MX), Mexico">MEX out of YYZ. On days of MX nonstop, YYZ will have up to 3 STAR alliance flights to MX), Mexico">MEX.