Listed below is a timeline of some of the more notable aviation incidents and accidents in which dangerous goods were onboard the aircraft. In most of these incidents, a definitive determination as to the root cause of the incident was inconclusive, but there is a general understanding that if the incident was not directly caused by the on board dangerous goods, the dangerous goods most certainly could have played a role in exacerbating the situation. This is due to the type of materials, location of the materials and sheer volume of the materials on board.