There's a follow-up already posted: http://dlo.me/flying-on-the-cheap/ http://dlo.me/flying-on-the-cheap/ That said, I'm not quite sure what he's trying to sho

There's a follow-up already posted: http://dlo.me/flying-on-the-cheap/ http://dlo.me/flying-on-the-cheap/ That said, I'm not quite sure what he's trying to show. Is it what days are cheapest to travel on, or what days are cheapest to purchase the tickets? And as has been noted, this approach is going to ignore Southwest and other airlines that don't show up on the aggregators, as the people doing this aren't going to go to every website.