An aircraft accident refers to an event involving an airplane that results in damage or injury. This can occur during various phases of flight, including takeoff, landing, or in-flight. Such incidents can involve commercial, private, or military aircraft and may lead to loss of life or significant property damage. The causes of aircraft accidents can vary widely, including mechanical failure, human error, or adverse weather conditions. Investigations are typically conducted by agencies like the National Transportation Safety Board (NTSB) to determine the cause and prevent future occurrences.