I was in Saginaw Mich. a few years ago. Had to fly home to Fl. at the spur of the moment. I went to the airport with only a carry on bag and bought a ticket. No reservation. They pulled me aside at security, asked questions and emptied my bag, dirty underwear and all and frisked me. They apologised and I said that I understand (which I did) considering that I showed up out of nowhere with a carry on and bought a ticket. I bought a coach seat but they put me in first class for my trouble.