Last weekend on PHL-IAH-SNA//SNA-SFO-LAX-DEN-OKC//OKC-DEN-PDX-SFO-SNA//SNA-EWR-PHL we had issues checking in on the OKC-DEN... day because of a change to a TED A320 aircraft. At the counter checking in the guy was having trouble believing that we were really flying 4 segments instead of 2. "Do you REALLY have business in all these stops along the way? Why are you doing this?" We shut him up, but it was certainly entertaining to watch him try to understand what is going on.