Ben,
There appears to be a lot of chaos (I'm surprised, frankly, in that Parker seemed to have the transition under control) with various "policy changes" at American already this month.
I flew LA-DC the other night, First Class itinerary and Exec Platinum level. I rarely check bags, but have a project where I needed to pack a lot of gear so planned to check THREE bags-- always OK for First Class pax and always OK for Exec Platinum. I turn up at the Check-In (Premium section) at LA and have her say "$150 for the third bag". I said "Huh!>?!"
Apparently they quietly changed a bunch of rules as of tickets issued after April.
It took 30 minutes and two conversations with the manager before they finally relented. (The counter agent told me she would be "fired" for waiving the fee.) Most troublingly, though, they had to pull out a piece of PAPER, recently issued, that looked like it'd been photo-copied 8000 times and hand-passed around... and it did confirm that an F passenger with EXP could check 3 bags for free.
Punchline is: rules are in flux, staff are confused and even the computer systems didn't get the memo on the changes correctly. If in doubt, call first to confirm. I nearly flipped out over a $150 "surprise" that was their error in the end.