It may have been the quietest attraction of the day.On a clear Saturday afternoon, Joby Aviation and Archer Aviation, two California-based companies focused on making electric vertical take-off and landing vehicles, or eVTOLs — pronounced ee-vee-tols — demonstrated their aircraft in front of a public crowd for the first time at the California International Airshow in Monterey County. The 10-minute demos came and went with nothing more than a pither. Only the sound of a slight hum and the crowd chatter co ...