In general, he seems fairly down-to-earth despite his royal status, but would you believe Prince William flew coach from Memphis to Dallas on an American Airlines flight as he was making his way back to the U.K. after a wedding?
(Side note -- can you imagine being a guest at that wedding? OMG. And how about the shot above of Wills, taken while he was touring Graceland?!? You gotta love it.)
I'm not kidding, people. I'm sure the nice folks over at AA could have easily bumped a person or two out of first class so he could sit up front with the rest of the important peeps where he belongs -- but he opted to rough it out in economy with the rest of the cattle. (And I don't mean that to be derogatory. How do you feel when you're crammed into your seat on a full flight?)
And yes, there's even photo evidence of his trip.