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I don't know about you, but on a plane I'm definitely closer to other passengers for longer periods of time than I am on most metro rides. It also exposes you t

I don't know about you, but on a plane I'm definitely closer to other passengers for longer periods of time than I am on most metro rides. It also exposes you to people from a geographically wider spread, and many of those people have likewise been exposed to people from even more different places earlier in their trip.

robjan 6y ago
That really depends. Many many people live in world cities where public transport is cramped and people from all over the world come and go in a constant stream.
- dredmorbius 6y ago
  And how do those people from all over the world get there?
  - robjan 6y ago
    There are many ways. Boat; train; bus and, yes, flying. International commerce will not stop forever and as long as that's true people will travel.
    - dredmorbius 6y ago
      And border crossings by mode are?