From swashbuckling to science -- the changing viewpoint towards aviation, within the field and without. The secret of flight in the shape of the wings, what makes planes go. A primer of the construction elements, of the interior equipment, of the instrument board, of the principles of flying. Discussion of weather, of air lane regulations and protection, of radio. Pilots -- requirements, training, testing. Passenger liners today. Details of a flight from call to goal.