We recently travelled on an Aeroplan reward ticket from Ottawa to Quito, Ecuador. Our initial flight out of Ottawa connected through Cancun, Mexico, with a 90 minute connection. I foolishly believed that Aeroplan would know the appropriate minimum connection time through Cancun airport. It turns out they do not. On arrival in Cancun, you deplane onto a bus, then to the terminal to clear immigration, pick up luggage (although it had been tagged all the way through and the Air Canada agent told us we would not need to pick it up in Cancun), and through customs where you may be randomly selected for baggage inspection (we were). Then we had to leave Cancun Terminal 3 via an airport shuttle, taking us to Terminal 2 to to check in with Copa Airlines, for our onward travel. Needless to say, the gate was closed by the time we made it there. Luckily for us, our inbound flight out of Ottawa was late arriving (likely due to de-icing before departure), so after a minimum of argument the Air Canada folks at Cancun airport agreed that it was their problem to resolve, and they worked with Aeroplan to get us re-booked to the following day. On further prompting, they also picked up our accommodations and meals for the day. Just know if you are coming into Cancun on Air Canada and connecting to a central or south american airline, the minimum connection time should be no less than 3 hours, in my opinion.