The 3-letter code for the airport in Sioux City, Iowa, is SUX. Har. Airport authorities have been fighting for years to get it changed to something that does not suck, but they have recently decided to embrace the name, using flysux.com as their website and printing t-shirts and hats with the name on it.
But really, the best part of this story is that the FAA offered them 5 other choices that the airport turned down. The best of those 5? GAY. Now THAT sux.