I needed to change my flight with Delta to an earlier time. The plane was a 737-800 rather than the 757 that I had taken there. Newer, but less roomy.
I had booked Delta Comfort, but I had a center seat. The unfortunate part is that I had absolutely no room on both sides of me. In fact. I believe I was smothered. It was an awfull trip and I called Delta for a credit of the comfort upgrade. They complied which was good.