Our good fortune FF mile cash in is $91.00 per person RT LAX to Rome in business class. On our Princess cruise in July our fare was $900 per person RT Lax to London. The upgrade to business class was $2200 per person making a total of about $3100 per person (as I said before the United listed fare is about $10,000 per person). We figured that we saved a bunch of money on the Rome trip so we could splurge. I know that by booking your own air you can save money, but often times, and we have done it, you have to go early to allow extra time in case of a delay. That involved getting a hotel at the departure port, which isn't usually bad, but it does require additional costs. So I think if time is important, sometimes the cruise lines can be competitive with their airfares.