EDIT: I posted this before I saw iamaho's post above. Same suggestion. I didn't have the PDF problem of blank pages. Maybe cuz I'm not a ho.

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Another option is to download a PDF version of Air Canada's timetable. Go to

http://www.aircanada.com/en/travelin...les/index.html

and click on "Download the timetable (PDF)" on the right hand side. In the timetable you'll see mileage for every city pair. The weird thing is that Aeroplan doesn't use those exact numbers. But they're pretty close.