To answer you last question . . . YES . . .aviation is almost a total waste of money and pollution . . . it is for the rich primarily to extend their vacations and party time. The occasional need for quick transport for medical evacuation, emergency spare parts can be accomplished by a fraction of the commercial aviation fleets. Military aviation is more of a waste . . .a total waste of life, money, and other precious resources. Aviation is almost totally unneeded . . . at least in its present bloated and ugly form. The world did quite well without it for two thousand years . . . give me one example other than the ones I mentioned above where it has been a necessary benefit to civilization? I will admit it has created some well paying jobs . . . .