Human performance plays a decisive role in aviation safety. While modern aircraft are equipped with highly reliable technology, the majority of aviation occurrences continue to involve human factors as one of the contributing elements. Pilots, air traffic controllers, maintenance technicians, dispatchers, cabin crew, and many other aviation professionals all contribute to the safe conduct of every flight through the decisions they make each day. Although human error can never be completely eliminated, understanding why errors occur and how they develop is one of the most effective ways to reduce operational risk. Studying past accidents allows aviation professionals to recognize common patterns, improve decision-making, strengthen safety barriers, and prevent similar events from occurring in the future. This book examines a selection of significant aviation accidents in which human factors played a major role. Using official accident investigation reports and internationally recognized safety principles, each case is analyzed to identify the operational, technical, and human elements that contributed to the event. Rather than assigning blame, the objective is to understand the chain of events and extract practical lessons that can improve flight safety.