Flying AA yesterday clt>avp and flight was not on any flight board I checked. CS says its E31. Arrive at E31 GA says its E15 now. Head all way there and Kansas city is boarding. Ask another agent and she said it will go out there. No updates from AA app or email. I have never seen a flight not on the board? I fly every other week but mostly with Delta but have never seen this. A question for the pros is this common?