Boeing is flying the 737 Max around the US with test crews and no passengers to prepare for the plane's return

· Boeing is preparing for the return of the 737 Max by flying it around the US with a test crew and no passengers on board.
· The manufacturer is testing its updates to the plane before they are examined by regulators to see if the plane should return to the skies after two fatal crashes killed 346 people.
· Boeing said it...