common it is. >> it's not uncommon. there are a host of physical illnesses that may have in part some level of psychological input. for example, stress can have a physical component. ulcers upset stomachs headaches, skin responses and those are essentially a physiological response. >> is it disqualifying for a pilot to have vision problems? would you have told a patient with psycho systematic symptoms not to fly as a precaution? >> it would really depend on the nature of the psycho systematic illness and the nature of the physical problems they were exhibiting. >> dr. aaron bowan, thank you so much for your incites. we appreciate it. >> thank you. >> with the mental and physical health in the days leading up to the crash, was there any way a