Vacation is related to Cabin. you are likely to find Cabin in/at/on Plane. 
Casualty is a type of Victim. Casualty is a synonym of Emergency. Emergency is related to Crisis. Crisis is related to Critical. 
Vacation <--RelatedTo--> Cabin --AtLocation--> Plane 
Victim <--IsA-- Casualty <--Synonym--> Emergency <--RelatedTo--> Crisis <--RelatedTo--> Critical 