Air transport usually calculates freight according to the weight and volume of the goods, but due to the limited load and space of the aircraft, airlines often use "volume weight" to calculate freight. Volume weight (kg) = cargo volume (cubic centimeters) / 6000.

Freight shipping is a broad concept that covers all aspects and services of cargo transportation. Cargo ships are specific means of transportation and are part of freight shipping, mainly responsible for maritime transportation.

Freight usually refers to bulk commodities or materials shipped by various modes of transportation, such as sea, air, rail and road. Unlike express parcels, freight is usually larger in size, heavier in weight, and involves more complex transportation processes.

Ocean transportation quality management: proper packaging (packaging must meet international standards), strict inspection (appearance inspection, size measurement, quantity verification), tracking and monitoring (real-time monitoring of goods).

In the case of cargo delays, companies need to develop a contingency plan to respond to challenges quickly. This includes adjusting the supply chain, rearranging inventory, and communicating with customers.

Promote electronic manifest systems and real-time tracking technology to ensure real-time sharing of cargo information around the world. This helps reduce information lags and improve the responsiveness of freight services.

Door-to-door air freight is an all-inclusive logistics service that covers all transportation links from the departure point of the goods (such as factories, warehouses) to the final destination (such as customers or retail stores).

Air freight rates fluctuate according to the time of year and the departure and destination countries. For popular routes such as China to the United States, as of May 24, about $4.5 per kilogram of cargo was paid. This means that air freight costs are about $4,500 per ton.

The maximum weight limit for air freight depends on the airline you choose. Generally speaking, each airline has its own regulations and restrictions. Normally, the gross weight of each shipment is between 100 and 500 kg.

The maximum size of standard air freight is 2.44 x 3.18 meters (96 x 125 inches). This size limit is to ensure that the goods can be safely loaded and transported and can pass through the door and cargo space smoothly. Goods exceeding these dimensions require additional arrangements and handling.