I flew SFO-JFK-SFO for a couple times in the past 2 month and luckily my upgrade cleared everytime which was awesome. One trend I noticed was the F cabin was 50% filled with AA non-rev (Position flights for flight attendants). This might have been discussed on here before, but why doesn't AA just upgrade EXP or elites from J to F so it opens up more J for EXP to upgrade from Y or allow others to use miles and coupons.