Lots of people have asked the question here (including myself) what happens if you want to make a change to a booking post December 15 ie will you have to pay the higher mileage levels. I asked this question to 3 different Aeroplan agents this week. The scenario was if I have a Europe 1 booking and wanted to make changes (not including any zone changes).

Agent 1 told me that yes the new higher mileage would apply.

Agent 2 told me no.

When I talked to Agent 3 I told her the 2 previous agents gave me 2 different answers. She then put me on hold to go get clarification. When she came back it sounded like she was reading from something which indicated that you would not have to pay the higher mileage levels as long as there is no zone change.

Take this with a grain of salt as this was verbal not written confirmation.