Shipping companies like FedEx and UPS own many different types of cargo planes. One of the larger ones is the Boeing 747. When configured as a freighter, the Boeing 747-400 can hold about 26,000 cubic feet (736 m³) of cargo. That's about as much as five semi trucks can haul.

Photo courtesy Hong Kong International Airport
Loading cargo through the nose of a 747-400

The 747-400 can hold 30 pallets of goods on the main level. The pallets are 96 by 125 inches (2.4 m by 3.2 m) and up to 120-inches (3.05-m) tall. For shipping horses, there are special containers called airstables that connect to pallets and fit in the cargo hold. On the lower level, the plane can hold another five pallets along with 14 specially fitted containers, each up to 64 inches (1.6-m) tall. All of these goods are loaded through hatches in the side of the plane.

As you can see in the picture above, the plane can also open up its nose for the loading of large or irregularly shaped cargo.

Photo courtesy U.S. Customs Service, photographer James R. Tourtellotte
A U.S. Customs inspector examines the cargo load in an airplane arriving from overseas.

Since there often isn't room to drive a forklift truck into the plane to load the pallets, the load floor is equipped with electric rollers. Once a pallet is pushed through the doorway, the electric rollers are used to move it to the front or rear of the cargo hold.

But for hauling really big cargo, you need a super transporter.