Airmiles -1-888-247-6453 in Toronto 416-226-5171.
I am using Airmiles for our Dec 22-29/06 trip to Ft Lauderdale. I called in Dec about them. I was told that seats usually were available about 6 months out from the date. Once I noticed WestJet had posted their flights, I called Airmiles, I was told not available. I called about 1 a week. March they had the seats. I was told WestJet has 5 seats per plane and Air Canada has 6. You pay for taxes and( if) you take insurance. If you take insurance with them and have to cancel you get your Airmiles back not if you take insurance with RBC for example.
Call right away, don't wait. I was told sometimes they may add seats if the plane isn't selling. I am sure seats for MCO are full. If you cann't get the dates you want, ask about the day before or after or another city.
I switched to MasterCard - Westjet and the miles are adding up, especially for groceries. You use less Airmiles for WestJet ( max 1,600) than Air Canada.