Although calling Girona "Girona-Barcelona" and Reus "Reus-Barcelona" is obviously geographically incorrect, they do fly to Barcelona, which they call Barcelona, and the rest of us call El Prat.
They don't fly to BCN, (El Prat). They have a city alias (BAR, I think) for Barcelona on their web site which then asks you to select either Reus or Gerona.