Because we're signed up for fare alerts directly from Air Canada, we learned about this 15% discount deal. The promo is valid for travel through May 31, 2009. This discount is available in economy as well as premium cabins, for both intra-Canadian and international routes.
So what this means, in case it's not obvious, is that every Air Canada fare you see on Kayak, Orbtiz, or those fare comparison and fare drop alert sites is 15% higher than it could or should be, at least for travel through May 31.
It continually amazes me that our media friends have not caught onto the fact that there is no incentive for a site like Kayak or Orbitz to alert their users to these promo code deals. These deals can only be booked on the airlines' own web sites by plugging in the promo code into the promo code box, and therefore the online travel agencies and meta search engines cannot monetize them.