Originally Posted by
canadiancow
That was because Aeroplan didn't reticket him after a change, and all the unticketed segments fell off, but that was the only one that no longer had I-space. Amusingly, AC3 had I-space, but there was absolutely no discussion about it. They just rebooked him on what he originally had, in Z (I think). Someone else (may have been DC, but I can't recall) was once told to buy a one-way J fare and submit for reimbursement under similar circumstances.
There is a difference between downline segments getting cancelled because Aeroplan didn't reissue a ticket in the appropriate time and a schedule change.
You're much more likely to have Aeroplan pay for a revenue ticket in the event they messed up.