When we took our PG cruise we were able to upgrade on Air Tahiti Nui for 600.00 per person which I thought was really reasonable. We were only able to upgrade one way as it was sold out on the way back. We did this upgrade at the aiport the day of the flight (LAX) directly with Air Tahiti Nui...do you think that this might be the best way to do it with Deta for our flight to Nice, France...clare