Just a side note if it hadn't been discussed already. I was told during my interview that the 175 out of IAH will do majority of its trips to Canada. Long flights, good amount of hours per trip and awesome overnights! They also said the trips being built for the 175's have been desirable by the pilots and that the response has been good. Productive long haul trips equals more pay in the wallet. I don't know how long it would take to get from Houston to Canada in a 175, but I imagine you couldn't fit more than one leg per day without timing out on the second. So it sounds like 1 or 2 legs per day, great block times and less hassle than you would have with multiple cities.