Email from AA this AM offering decent prices FNT to West Coast
About 2 hours later I prepared to book and FNT has totally disappeared from the cities list. Many other fares, eg from DTW, also gone. Per AA site: there are currently no fare sales

The fares were definitely not so low as to be considered mistakes, just the usual range of fares. First time this has happened in my experience

But: just checked, and at least one of these fares is still available: FNT-SAN $354

So maybe it's just the cities list that has a bug