Secret Flier Programs: 'Skull And Bones' Of The Sky

<strong>Playing Favorites:</strong> Airlines have long sought to make their first-class passengers comfortable. In this 1970 photo, a Pan Am air hostess serves champagne in the first-class cabin of a Boeing 747.
Playing Favorites: Airlines have long sought to make their first-class passengers comfortable. In this 1970 photo, a Pan Am air hostess serves champagne in the first-class cabin of a Boeing 747.