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The greater part of aviation accidents is often attributed to human error, with flight crew performance accounting for the majority of these mishaps. In 2016, the Federal Aviation Administration (FAA) published a rule to address pilot professionalism and to increase the likelihood that aviators adhere to standard procedures and prevent behavior that could lead to pilot errors in the airline domain. The FAA has identified 5 Hazardous Attitudes that afflict pilots: macho, impulsivity, resignation, invulnerability, and anti-authority. This study examined the FAA-defined Hazardous Attitudes and the regularity with which they occurred in the U.S. air carrier flight crew related accidents between 1991-2018. The top two Hazardous Attitudes were anti-authority and invulnerability, which were found in 92% and 68% of aviation accidents, respectively. The paper also explores the relationships among these Hazardous Attitudes and other contributing factors such as time of day, weather, flight conditions, and crew resource management, among others.