Abraham Gubler said:They are the names of the three models: "The Good, the Bad and the Ugly" which is also the name of a famous Spaghetti Western starting Clint Eastwood:
http://www.imdb.com/title/tt0060196/
The three names refer to the Man with no Name (Clint Eastwood), Angel Eyes (Lee Van Cleef) and the Rat (Elli Wallach). The Kansas Uni team have given each model one of the names referring to the characters. Though really the difference between the three aircraft is size based, not morals and appearance.