In a study of pilot suicides from 2002 to 2013, eight cases were identified as definite suicides (with evidence of suicide notes, previous attempts, or disorders that affect your mood, thinking and behavior), with five additional cases of undetermined cause that may have been suicides.
In a study of pilot suicides from 20022013, eight cases were identified as definite suicides, with five additional cases of undetermined cause that may have been suicides. This evidence would include suicide notes, previous attempts, threats of suicide, or a history of mental illness. 
