Yep, I normally fly into BIO and drive to San Sebastian. On the way back, we'll probably drive to Barcelona and make our way back to SFO from there.
The difference between BA and AF first for 3 people is about $2500 total. Considering how much the entire trip costs in the first place, it doesn't sound like a huge amount to give my dad a fantastic experience (and his very first first-class experience) on AF for his 60th bday!