I'm almost to the point of ONLY wearing flip flops to the airport. If I'm wearing jeans, then I have a pair of KEEN flip flops with the little rubber molding over the toe that keeps you from accidentally stubbing your toe, they look a little nicer than the el cheapo $5.00 kind, the TSA's haven't made me take them off yet. If I'm going "business casual" or polo/khakis, I'll wear a pair of "dressier" ones.