A pilot license can be cancelled or suspended due to serious safety violations such as flying under the influence of alcohol or drugs, repeated breaches of air traffic rules, falsifying flight records, negligence leading to accidents or near-misses, or failure to maintain required medical standards like losing Class 1 medical fitness, while regulatory violations such as fraud, certification cheating, or unauthorized operations can also lead to strict action; aviation authorities must enforce these rules very strictly because aviation safety depends on zero tolerance for high-risk behavior, and consistent enforcement ensures passenger safety, operational discipline, and trust in the aviation system.