I told the customer service rep. I had no way of knowing this as the website class of fare simply says, "Tango Plus". She informed me, in that condescending way that only Air Canada employees seem capable of pulling off, that the upgrade-eligible M or U class Tangos are "very expensive", and, wait for this, "you cannot book them online -- you have to call Air Canada". Well, pardon me for using the Air Canada reservation website and thinking I could use a Tango Plus upgrade coupon when I, you know, booked Tango Plus!
Air Canada's upgrade coupons are effectively, how does one put this, useless -- and I told her so. At which point, we mutually agreed the conversation was over.
Montreal-based, government-backed, union-sogged, privileged, Air Canada vs. the energetic, entrepreneurial, Calgary-based WestJet.
Paradigms for the two Canadas. One belongs to yesterday; the other, tomorrow.
I know which one I want to become Canada's airline.
And that's the way the Ball bounces.
UPDATE: Turns out what she told me about having to call Air Canada wasn't quite true. I found this: "When booking on aircanada.com, always use the “Display Only Fares Eligible for Upgrade” option on the “Select Flights” page. This option allows you to enter the serial number indicated on your certificate to view the lowest fares eligible for an upgrade with that certificate." I tried this, and the cost of the ticket, one-way, went up by $450.