Well said, ATC! If I didn't have the "loyalty" factor to US, I know I'd be looking at the other options. Miles are one thing, but it's the little perks that make it worthwhile. I think I'd rather fly E+ on UA instead of upgrading on US now.
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A "Mileage Run"... is that what they're called? I've been doing them for years and didn't know they had a name.