A pretty interesting discussion on the personality traits of pilots... Yes there are trends, and differences with the rest of the population.
By a practicing consulting psychologist.Interesting read.
Pracical Use of the Pilot Personality Profile
by Robert G. Rose, Ph.D.
http://www.avweb.com/ articles/personality/
Quotes from the article:
"pilots are the most consistent and even-keeled group anyone is likely to meet"
"Pilots generally have good social skills and good reasoning"
"others can see you, at times, as chimerical"
"Firm but polite" describes the typical pilot.
"Pilots are positive but they remain so by questioning everything that could go wrong. They are diligent but they do not like rushing, especially to meet artificial deadlines. They are interested in what's going on but like to have a quick overview of the big picture at the outset and they like their information to be concise."