you are likely to find Cargo in/at/on Airplane. you are likely to find Cargo in/at/on Plane. 
Hard is related to Effort. Pull is a type of Effort. Haul is a type of Pull. 
Airplane <--AtLocation-- Cargo --AtLocation--> Plane 
Hard <--RelatedTo--> Effort <--IsA-- Pull <--IsA-- Haul 