It seems that while I am on a one way ticket, the travel agent file contains a flight on AA tomorrow. When I went to check in the AM, it showed the flight for tomorrow and said I could not check in. Fair enough.

Now the question is why do they care what I do the rest of the week when I check in for a flight. Guess I'll spend some time on the phone asking/complaining about it.

Maybe they are trying to make it tough if you fly somebody non SA.