Same happened to me. I have a 5 sector trip in October and November. 4 out of the 5 have been changed. A couple by only 5 or 10 minutes, but one by an hour and the other by 45 minutes. Flight numbers all changed too. I only knew that there had been a change because I logged on to change my seat on a sector.

I ended up having to change two of the sectors as I did not want to get into SFO after 11pm, I should have been charged a $150 change fee, but the lady in the Dublin office waved the fee for me.

I have never flown with AA before, the majority of my travel is with BA and I have always had an e-mail with a flight time change. Is it normal for AA to e-mail? But just at the moment they are not? Or they never do it?