I was using one of the computers in the AC in D concourse at DFW yesterday. I was 99% sure that I did log out but someone began to tamper with my AAdvantage account details by changing my email address and so on.

Beware!! -be careful when using those computers - there are evidently some not very nice people in the AA system.

Not AA's fault by any means they were extremely helpful when I called them about the issue.