I'm not saying that it's would necessarily be the best business decision for Delta, I'm just saying that it would be even more incentive for me to stay loyal to Delta.

And loyal to Delta I am: I don't just use them for all of my TATL travel, but for all of my domestic as well (which is not as frequent, but typically transcontinental), whether it's for work or leisure. I rarely bother even checking other airlines' prices, as the combination of convenience (I live in Atlanta), miles, and Delta's generallly very good service keeps me coming back. My loyalty's been rewarded, too: lots and lots of award travel over the years, as well as the various perks that come with status.

PMUs just happen to be a perk that adds exactly zero value in my case. And if Delta can suck an additional $1 or 2K out of business travelers with far deeper pockets than mine and thereby stay in business and keep offering me frequent, convenient flights to just about anywhere I care to go, then I'm happy.

I'd just be happier if I could, every once in a while, upgrade.