Looking to book a CUN trip for next February, I looked up availability on expertflyer. I was able to see AA flight data for both my departure date (Feb. 18) and my return (Feb. 25), yet when I went to book on aa.com, the return date is not available yet (it looks like it will be tomorrow). Can anyone explain this disconnect (i.e., why the data is available on expertflyer but aa.com will not sell the seats yet)?