After officiating his daughter's wedding, a pilot flies celebratory passes over the reception party, with tragic results. Two months earlier, a seasoned pilot crashes his plane into the river while conducting a routine post-maintenance flight. Follow the NTSB Alaska Regional Office investigations of two crashes: one which resulted in an unexplained loss of control, the other, in a surprising medical discovery. To find the cause of these accidents, they must navigate rough terrains and help the grieving

Source: Smithsonian Channel