Dear Fellow Traveler: Walking through MIA recently, I felt compelled to compile a list of 'helpful tips' to get us all safely on our way. And by 'helpful tips', I might mean a list of 'pet peeves'. And by safely, I really still mean 'pet peeves', but I'm trying to sound congenial. I'm a middle seater after all. So please read on for my "Top Twenty Travel Tips" to make all of our travel experiences a little more enjoyable. And by 'all of us', I mean me. 1. The concourse