I've tried booking flights from AMM to DTW and AMM to ORD - the flights both show as available (on multiple days) but when I go to book, I get an error message:

We're sorry but at least one of the flights or fares you chose is no longer available.

I've tried calling AA and the agents can't seem to help. This has been going on for about three weeks. Any thoughts on if this is just phantom availability or if I could try booking through a different AA call center?

Thanks!