This happened to me once with Delta Airlines a few years back. I was ticketed for an upgrade to first class (via Medallion status), but when I went to board I w

This happened to me once with Delta Airlines a few years back. I was ticketed for an upgrade to first class (via Medallion status), but when I went to board I was told that the stewardess had given the seat to another customer and I was moved to a middle seat in the back. As someone who tends to be non-confrontational and the fact that it was a short flight, I just went with it. I did complain when I got back via their feedback form and they compensated me with 7500 miles, which I now realize was woefully inadequate, but I didn't have much recourse.