Yes, the first site that has JetBlue and SouthWest comparisons with the major airlines will have my traffic. I usually prefer to travel on price when it's not business so I love how Google has made this clear - that's my core problem with Hipmunk and I'm not sure why they don't just tell you the cheapest days to fly, like Kayak at least tries to. I also like how http://skyscanner.com does it.
I love your site. It easily has the best UI. I knew in the back of my mind that you have the "flexible" feature, as I've seen it before, but never thought about or even bothered to use it, because it just isn't visible enough. It may help to make it a link on the results page, and perhaps mention it on the loading screen as well.
Google Flights only supports the US at the moment. I see this as a good thing for Skyscanner which covers Europe well, they can adopt and implement new ideas from Google Flight search before Google gets around to other countries.
