Originally Posted by
xliioper
Fare quote may or may not be valid with multi-city (you only find out when you attempt to purchase). But yes, these fares look to be valid and the PE fare is actually the cheapest. I used TPE instead of TSA in previous search (since OP said TPE) and ITA is seeing this fare to TSA too.
Don't need to use multi-city - just a simple CLT-TSA oneway search brings up those results on AA.com.
At this point, none of us are having the same issue OP was, so need OP to come back and tell us if they were able to purchase.