Originally Posted by
gaobest
Here's a puzzle - what to do if UA / aa F is 20-25% less than Vx F. I'm not sure what to do because it's great to save $ but the F is just inferior. But I'd still think that F on a bad airline is better than VX Y even if VX is more pleasant of an airline to fly.
Assuming it's AA J on A321, fly it and credit miles to AS. If it's AA three-class F on A321, no contest.
If it's regular AA two-class F, I'd leans towards VX F.