What does 14 CFR Part 91 primarily address?

14 CFR Part 91 primarily addresses General Operating and Flight Rules, which establish the regulations and standards that pilots and operators must follow while conducting flight operations. This section of the Code of Federal Regulations outlines various operational practices, including but not limited to the responsibilities of pilots, rules for flight visibility and cloud clearance, airspace rules, and procedures for operating aircraft in controlled and uncontrolled airspace.

It serves to enhance the safety of flight operations and ensure that all pilots operate under a consistent framework of rules. This is critical for maintaining overall aviation safety and efficient management of airspace. While the other options touch on important aspects of aviation, they fall under different parts of the CFR or are more specialized areas within aviation regulation. Thus, the focus on General Operating and Flight Rules captures the broad and foundational influences that Part 91 has over civil aviation operations.