I travel a lot. Not many destinations but I do pass through London which is a hodge-podge of people and languages. Going through the other day I saw a couple, upper-middle aged. Woman was an uncomfortable traveler, man was trying to show off how world-ready he was. She asked a few innocuous questions, he answered surely, confidently. She then asked what type of plane that was and he said “Boeing….. hm or maybe an Airbus. One of the two for sure”. She beams knowing her man knows commercial aviation. Good guess Mr Been There Done That.