Well, to be brutally honest... If I was running an airline and was offering BTC, I would not load any extra food and would insist that those who ordered BTC eat BTC. After all, airline had to pay for the food to be prepared and if you do not eat it and insist on something else, the airline is at loss... And, I do not think class of your airfare should matter... I think people are being spoiled too much already anyway...