My experience is that Westjet to Orlando is often more expensive than AC but there are sales out there. They seem to come and go like the wind (which this year, never does seem to go does it?) I have booked travel with CAA a number of times and while they are great at some things, I haven't found a better air deal from them than I could find on my own and here in Alberta all the CAA specials that I have seen apply to DL (although, I may miss stuff). We have also flown out of Great Falls in the US, but we are further south of you and equadistance from Calgary and the border. I did also discover, from checking around, that you can often fly into Tampa much cheaper than Orlando. If you combine the WDW vacation with some St. Petes or Clearwater beach time, this may be an option. Good luck and if you find a killer deal, let me know.