Was DL GM through 2001. Switched to AA and this was the right move. DL upgrade policies (domestic & intl) and their lack of MRTC cinched the deal for me. Plus, I always thought Delta such an awkward name for an airline (reminds me of toilets and teeth, not aviation)- have never understood the affinity so many have for this company- I grew up flying Pan Am and TWA (dad was State Dept) and never even heard of DL till I took a job in Atlanta out of college. Bottom-line: Too many negative features to DL's program compared to AA's.