Returning from LA a few years ago I notices a P-51 Mustang a few thousand feet below and to the side, headed in the same direction. The contrast in technical progress was striking. There was a pilot sitting behind a hot, vibrating, roaring Merlin V-12 probably pushing a bit over 300 MPH! Here I was, sitting with a few hundred people in quiet, air conditioned comfort, relaxing with a cup of coffee, looking out the window, passing him about 200 mph faster!