United Parcel Service engages in global package delivery and supply chain logistics services. The business relies on a massive fleet of cargo aircraft, ground transport vehicles, and an automated sorting center network to provide time-definite courier services, bulk freight forwarding, and international cross-border shipping. Additionally, the company assists corporate clients with warehouse management and reverse logistics processing. Daily revenue primarily originates from charging individual and corporate shippers logistics freight fees based on weight, distance, and service level.