We did a b2b last year on Voyager, Dover - Monte Carlo, Monte Carlo - Rome. We got a combo savings, and on one of the segments we got the air credit. We took the business class upgrade, flew to London and back from Rome. Since we booked in on Navigator the fall before, we also got an onboard booking discount and the SS savings that was available on all cruises at that time. I'm pretty sure you still get a combo savings, and then you only pay the air once, they combine it somehow, the SS savings as we all know only show up on some cruises.