OK, I could get google to book the connection, as long as the trip originated and ended in BNA instead of TYS. (BNA-JFK-BCN-CAG, CAG-BCN-MIA-BNA) is bookable via Iberia, but (TYS-PHL-BCN-CAG, CAG-BCN-MIA-TYS) is not. I guess that means that Iberia does not have a fare filed from CAG-TYS? And no one other than Iberia will construct the VY-AA connection in BCN?

I can probably fly out of BNA instead, so this might be a solution. But if someone could help me figure out how to force the fare from TYS instead, I would very greatly appreciate it.

Thank you,
Saunders111