I typically search the AA portal for the right flight, timing, and cost.  Once i have all that figured out i go into Concur and book it.  I found the flights i need for an upcoming trip in the AA portal - i then go to the Concur app and the flight is there, but the fare is not available.  

Any insights or support on this issue?  

I've call AMEX and they are seeing / experiencing the same results.  They said that AA is not letting Concur have full access to the inventory. 

I called AA and they were not helpful at all.  Said this was a concur thing and needed to be troubleshoot from that standpoint.

Please help / advise 

Colleen Kirk