I thought about flying Southwest from Buffalo, but dh and I chatted about it and it's not worth the hastle right now while our kids are young. I'm willing to spend extra money on convenience. I worked on numbers too and I also worked in the value of our time. In our case, it worked out cheaper to fly Air Transat from Pearson. We had a good experience with Air Transat in April 2001 and Pearson. Everything ran very smoothly, we even spent an extra $60.00 to per book our seats ~ WOW, that was REALLY worth it! I have been viewing the different prices from Pearson and they all seem to be within a few dollars of each other right now. S