We're still tossing the idea around about getting these again this year. The only thing holding us back is the booking class change. There was one line on the FAQ's that intrigued me:

When searching for a flight from Canada to the U.S. on aircanada.com, I can't find the Tango fare option. Does this mean I can't book flight credits using my Winter Getaway Pass?

While the Tango fare option is not offered for regular flight bookings, it is offered for flight credit bookings for the Winter Getaway Pass.

Does this mean that they hold back certain Tango fare seats from the general public so they are available to people with flight passes - or am I reading this incorrectly....?