Has not worked for me for a long time now, even before the most recent update. The previous version displayed a spinning wheel; the current version shows a blank page. One thing I discovered a while back is that the feature does not work for trips booked via my employer's travel agent. If I book a personal trip on AA.com, the app allows me to change seats. I also happen to have an Android phone and the seat selector works just fine for both corporate and personal itineraries. Go figure.