National Airlines Constellation: This zip includes outer livery, new cockpit, new loading stairs. Yes the whole package. This livery depicts factory new and as delivered to National Airlines in the fall of 1957. They used it along with three other Super Connies for their New York to Havana route. They were later used on their "Club Coach" service. 

New Cockpit: All new textures in the cockpit to depict factory fresh. (see screenshots)

New Loading Stairs: Loading stair units have airline correct logos. (see screenshots)