Exactly, and when you're flying, flip-flops are great. You can easily take them off at security (and sometimes they don't make you bother), or on the plane, and slip them back on if you want to use the lav. I don't get the people who are disgusted by the idea that other people have feet or by witnessing this fact.

Hell, where I come from (the snowy Northeast), flip-flops are kosher as long as there's not snow on the ground. For my high school graduation, all the gents wore khakis, jacket and tie, and flip-flops. For me, it's either flip-flops or boots, or boat shoes if I need a closed toe