Take a step back and look at the big picture. Your son is already "spoiled" compared to the general population which certainly doesn't get to hop on a jet and go to New York for the weekend as a matter of course. Has this sort of priviledged life made him unbearable? Is he rude to others or feel superior to them in any way? If not, you have successfully kept from spoiling him so far and I don't think which class of service you ride in will make a difference.

So now we are down to the real issue, do you want to be at odds with your wife over this matter?