A railroad, sleeping car, dining car, boat, or steamship
company or air common carrier carrying interstate or foreign
passengers on trains, boats, or airplanes shall not be deemed to be
an importer or subject to an importer's license for bringing into
this State alcoholic beverages for the purpose of sale within this
State on the trains, cars, boats, or airplanes on which the alcoholic
beverages are brought into this State exclusively to passengers or
employees not on duty, and for carrying the same alcoholic beverages
or any unsold portion thereof out of this State in due course of
operation.