Maybe this is my unpopular opinion, but Dr. Pepper out of a can on a plane at cruising altitude (~8000ft elevation equivalent) tastes way better to me than anywhere on the ground. I call it my magic sky juice. Dr. Pepper is really the only soda I enjoy, anyway.

I am unsure if there are any other changes made to the cans of soda they serve on planes, like a different carbonation pressure, etc. that might make a difference instead of just the altitude.