I received a letter in the mail this week from Porter. 100$ off Toronto City - Montreal flights (round trip or 50$ one way). One of the benefits of flying less AC metal I guess Book before April 27th 2012 for flights before September 4th 2012. The promo code can be used online: 100 I don't see anywhere where its targeted, or that you have to present the certificate. And given the generic code, it certainly doesn't seem to be one use either. So hope it can be of some use to someone.