How frequently are maintenance checks scheduled according to United’s SOPs?

The maintenance checks are scheduled based on aircraft type and regulatory requirements because different aircraft have distinct maintenance needs depending on their design, complexity, and usage. Regulatory bodies, such as the Federal Aviation Administration (FAA), mandate specific maintenance schedules that airlines must adhere to in order to ensure safety and regulatory compliance. This methodical approach helps maintain the airworthiness of each aircraft and aligns with industry standards. By considering both the type of aircraft and adhering to required regulations, United Airlines ensures that maintenance is proactive and systematic, minimizing the risk of mechanical failure and enhancing passenger safety. The other options do not provide a structured or compliant method for scheduling maintenance, which is critical in the aviation industry.