Paid extra to have a seat only to find 2 hours later that l had no seat. Chose a crappier seat and now that is also not showing. On top of that, the app won't work on my Google Pixel phone but will on my husband's pad...though that won't help me at boarding since I'm flying solo. After massive amounts of digging, l found my record locator after a call to American Airlines, so l will check in through them instead. Sadly, l still don't have an assigned seat.