In Airline Empires there are no cargo flights but cargo flights would be a great thing of all game worlds.
When a new game world starts, players cannot select cargo aircraft as their starting aircraft but are available to order cargo aircraft and buy used cargo aircraft on the 2nd day of the world (example, 2nd day would be 2nd of January 1990 and an cargo aircraft would be 747-400F, 737-700F etc)