Usually I try to dress up a little bit when I am traveling. My parents always made us dress up for plane rides, and it's one of those things that has stuck with me through my adult years.
Last weekend I broke my code and decided to wear sneakers and comfortable pants on the plane. I don't know about you, but comfortable clothes make me move a lot more than heels and a skirt, and I was pleased to be comfortable. Not only did I find myself walking around the terminal a lot more while skipping moving sidewalks and escalators, jogging to make my connection was not an issue with my sneaks on. You may already do this, but if not, think about traveling sporty on your next trip. You might find that you'll even end up burning calories while killing time. Happy travels!