problems. some medications are bad. but some pilots say they don't always get asked about psychological issues and it's often up to pilots to report those and to report any medications they are taking. >> if he or she doesn't self report, what happens? >> if you don't self-report, it's gone unnoticed. typically what happens is if you have an issue, one of your crew members might recognize something like that. >> reporter: do the airlines check on pilots to see if anything's come up in their personal lives that might cause concern, financial problems, maybe a worrisome illness in the family? >> the short answer is if you miss a trip for a particular reason -- >> reporter: ache said that if they started doing that, privacy issues would be raised. does this mean that there's gap in the system. >> pilots for the most part are very mentally stable, very determined, very professional. i don't think that you're going