friendly and well-mannered and seldom socialized within the community. still, sources say investigators are focusing on both men, especially shah, if for no other reason that he was in charge in the cockpit. >> they are interested in the state of his marriage, his views of malaysian airlines which he apparently was unhappy with what he perceived as mismanagement and corruption. they were looking at the views of his son for his recent unemployment. >> reporter: so far sources have not confirmed those sources to cnn and interviews with shah's family and the forensic examination of his hard drive hasn't turned up anything that would explain the plane's disappearance. though investigators also say a lack of evidence indicating premeditation also doesn't rule out the theory that one of the pilots could have snapped in the cockpit. >> just because there's no previous history does not mean that the individual didn't have an episode that led them to do something that they would not