We've had several changes on our February trip - some inconsequential - one that was not but AA took care of it very expeditiously, so I can hardly complain about that.
Just notified of yet another change that will affect our class of service (we got downgraded due to equipment change) - got off the phone with customer service and they promised to refund the fare differential of our two tickets if we do end up staying downgraded - which would amount to about five hundred bucks between the two of us - which would buy some nice dinners and several bottles of rose' on the island...