Here is my SS Air situation- I normally book my cruises two years in advance. On SS and Regent, even two years out, they give me a price for the SS Bus Air upcharge or with Regent, the Bus Air is included. I can't compare the upcharge to the airline prices since airline prices don't come out until 330 days prior to flying. That being said, I book my SS or Regent cruise with the Bus Air. Once I am 330 days out from flying, I check to see what the airline prices are for the same destination. So far, SS and Regent air is less that the tickets that I could buy. I think inflation has a lot to do with this equation.