Position is related to Owner. Owner is related to Farmer. 
Plane is related to Aircraft. Aircraft is related to Passenger. Fare is a type of Passenger. Fare is a type of Food. 
Position <--RelatedTo--> Owner <--RelatedTo--> Farmer 
Plane <--RelatedTo--> Aircraft <--RelatedTo--> Passenger <--IsA-- Fare --IsA--> Food 