I booked some domestic flights, all in Tango+ for July. There was a $30 difference, but these flights will get me to Prestige status (yeah I know), so I just did it for the status miles. I know quite a few other students who do the same thing for the miles.

Westjet hasn't been cheaper than AC, in Tango or Tango+ recently for any of the dates or routes I've been checking out.