you are likely to find Clock in/at/on Airport. you are likely to find Landing in/at/on Airport. Touchdown is a type of Landing. 
Crew is a type of Unit. Crew is the opposite of Cast. Cast is a type of Shape. Shape is a synonym of Determine. 
Clock --AtLocation--> Airport <--AtLocation-- Landing <--IsA-- Touchdown 
Unit <--IsA-- Crew <--Antonym--> Cast --IsA--> Shape <--Synonym--> Determine 