I initiated a charge back with TD Visa on Monday for my two cancelled AC flights. The customer service rep. seemed optimistic. I will report back if it’s successful or not.

There are just too many annoyances with the AC vouchers:

1. You have to call and speak with an agent to use it and book a flight.
2. Amy remaining balance is forfeited.
3. Vouchers cannot be combined.
4. You still have to pay the taxes/fees on the new airfare; only THEN do you get a refund for the taxes/fees on your original purchase.