Just had an interesting conversation with an agent on the AA Plat line...
US-operated flights IAD-CLT-PDX-CLT-IAD pricing out at $239 on US.com. Had a $200 AA voucher, so wanted to book on AA.com. Pricing out at $340 on AA.com. Called agent, who couldn't even see the flights under either the US or AA flight numbers (I gave her both). She also told me that she learned last night that AA vouchers can't yet be used on US metal...
Needless to say it is still a work in progress. Too bad, I thought I had found a nice MR too.