Woo Hoo, finally got a helpful knowledgeable AA agent. I switched our flight from LAX to BCN on AA #34 (A32a 32B V1 Version) to JFK connecting to #66 (777-200) to BCN. I tried for LAX to Charlotte but no availability on to BCN. No extra cost or miles. I'm happy camper.
Thanks you all for your help due to my naivety.