We travel A LOT and I generally change Jett :
1. in the car (on my lap, the seat, or the floor of the trunk)
2. in a bathroom (standing up and holding him or squatting with him on my modified lap or on a changing pad on a sink counter) I rarely use the grubby, nasty changing stations.
3. near the wall in a restaurant booth. nobody ever notices and it's quick and easy.
4. in the grass.
5. et al....any old place seems to work.
Obviously, only some of these work with poopy diapers.
While a young mom was changing her daughter the other day in a mall bathroom, using the changing station, I walked in with a diaper and Jett. She smiled at me and went back to what she was doing. I didn't really see any need to wait, so I just changed Jett while I was standing there. As I was zipping up my bag, she finishes, turns around and says, "Do you need to change him now?" basically offering to listen the changing shelf down for me. She didn't even notice...even though I was standing right there.
It was kind of funny. Anyway....get creative...you'll find good options everywhere.