I was PM on DL last year. Unable to upgrade any international fares. Threw away 6 PMUs since they are non-transferrable. Sat in coach on LUser fares while F seats went empty. F seats are now whored out to non-elites willing to pay cash at the gate, so there are even fewer operational upgrade chances.

This year, I have already flown over 100k miles on AA. I have given them a nice mix of business and leisure fares . I have upgraded most of my international flights regardless of fare and have received several operational upgrades domestically as well.

AA will be getting my business first for the forseeable future and DL will remain as my second choice, providing they don't get any worse.

I am one happy AA flier!