Originally Posted by
radiowell
I heard that 90% of FC seats for all domestic airlines are upgrades, and I actually didn't believe it at first, but there are more evidence to suggest it (may be not true for US since the F fare is cheaper). This post from UA basically sums up why elites are so spoiled by upgrades (and why airlines try not to fly wide bodies, domestically)
http://www.flyertalk.com/forum/21631514-post49.html
Interesting...
I believe this. I tend to peek at the printout on flights to see status etc. I think 10/12 or 14/16 are upgrades. That is the reason I keep flying US. If that goes away, so do I. I do 150+ segments annually. I can easily put 75 of them on Jet Blue, not for upgrades, but for direct flights to New England.
You can screw with a lot, but when you start to screw with upgrades, you will see a LOT of grumbles.