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Flying cargo planes presents its unique challenges, especially since much of the work occurs at night. While many cargo pilots relish their roles, the nocturnal nature of their operations can lead to significant fatigue. In January 2012, when new rules regarding pilot flight time limitations were introduced in the United States, cargo pilots were exempted from stricter regulations favoring their passenger-carrying counterparts. This exemption stirred frustrations among cargo pilots, who felt that their fatigue management systems weren't as robust as those mandated for passenger airlines.