So, from 'Royal Service' by Charles valet of 12 years in the chapter entitled Travels with my Prince, page 140: "The first time I really flew with him was three months after I started the job. We went to Fiji to confer independence on the Islands and from there we went more or less around the world. When the last Prince of Wales did his world tour by battleship it took him many months. when we went, using an RAF VC 10 for part of the time and travelling commercial for the more lengthy trips, it took four weeks. We preferred to use an RAF planes because we could adapt our timings. A commercial plane has to be caught. With the RAF we could come and go at our own pace". Later the same chapter page 145: "When we flew commercial it was quite different. These flights were rather boring. The Prince never drinks so none of the rest of us would take advantage of all that lovely free first class champagne. Also, people dont realize until they get to the airport who is going to be travelling with them. It only dawns when the full fare paying passengers get irritated when the plane is late leaving....Just to calm everyone down, when we did take off, the Captain always apologized for the delay and then said "As a consolation and with the compliments of the airline, may we offer you an open bar....For these reasons we did try to use RAF planes. Traveling commercial throws a lot of people into confusion and ruins the bar profits...A lot of surprised first class passengers have found themselves sitting next to the Prince passengers, and it creates a very silent flight with everyone on their best behavior...Of course, people are still pleased to have seen him in the flesh. And when he leaves, he pops his head through the curtains to where the second class passengers sit so that they can get a look at him too.I must say working for him gave me some spectacular treats. Once we flew the Concorde to New York just to go to the ballet and came right back again. Another time we flew from Vancouver to Florida to play polo at the new Wellington Club complex.'
This type of behavior combined with the more recent examples Camilla's gas guzzling yacht trips and her having her shoes that she forgot at highgrove flown out to the persian gulf, only to decide against wearing them, gives me a strong Do-As-I-Say-Not-As-I-Do vibe from Charles. When it is less than convenient for him, global warming is way down the list. He obviously had no touble travelling commercial for many years. Needless to say, this is IMO and that the above bolding is mine.