Originally Posted by
ByeByeDelta
I did All Carriers at the suggestion of Web Services who claimed even though they carry an AA flight number, it is another carrier. Did that with no results so she blamed it on the schedule changes being processed last night.

How strange -- trying right now with "only AA" selected, I have no trouble pulling up a ZMU-bound codeshare. Web Services is usually pretty on the ball, though, so I don't know...
There were a few threads in the last two months about the DB trains talking about how they were no longer bookable on AA.com -- it seems that they disappear every now and then but do come back. I'd keep trying if you're still having trouble.