I was looking to go to Toronto on the 14th or 15th of July. With the 30% discount that expires today the lowest tango fares are 55$ each way for YUL-YTZ. I've been trying for a few days, but if I select any of the lowest fares, with a return at the lowest fare (55-55) and click continue the flight selection page just reloads. The only way to get a ticket is to select more expensive fares (for same day return). I've tried Chrome, IE, cleared cookies. Can't book a same day return fare at the lowest rate and I've tried a few times over the past few days. YUL-YYZ for the same days, same fares, same discounts books fine. I just thought I'd try the new planes and airport. YTZ charges 5$ less in airport improvement fee's, but that wasn't my motivation. Any ideas?