With the exception of one Amerikilt, all mine are USA Kilts. 4 casuals, 3 semis and another semi on order. I love all of them, but am partial to the semi for all the reasons listed. I look at the casuals as equivalent to dockers from when I still wore mostly pants and the semis are definitely dressier. As far as flying, the only issue I have had is that the buckles on the semis tend to set off the metal detectors, so will probably go back to the casuals (unless a high wind is predicted, then I'll brave the TSA). You can't go wrong with the work of Rocky and Kelly.