Originally Posted by
canadiancow
I've done this as recently as last night.
'Hi, I'd like to book a ticket for one passenger. I have flight numbers and fare classes. My Aeroplan number is 123456789. On June 14, I want AC 123 YYZ-CDG departing at 1830 in K class. On June 15, LX 234 CDG-ZRH departing at 1130 in S class, ..."
Then when you're done, they price it out, and it should match to within $10.
You might give them the complete fare code, not just the fare class.