This seems like the kind of thing that would have been posted by now, but I couldn't find it.

When you initiate a booking on AA.com, the flights with MRTC are now identified by the AA More Room logo. While "those in the know" are aware of which flights do and do not offer MRTC, I still think this is a nice feature who may not be aware of the change, or for those who might space out from time to time while making a booking. (Of course, all MRTC would be even nicer. )