Air transportation, abbreviated as aircraft transportation; Air transportation is a transportation method that connects air routes and airports, using airplanes as a means of transportation to transport goods.

The weight of air cargo is calculated based on gross weight. The unit of measurement is kilograms. Those weighing less than 1kg are counted as 1kg, and those weighing more than 1kg are rounded off. The weight of each batch of cargo loaded on non wide body aircraft generally does not exceed 80 kilograms, and the volume generally does not exceed 40 * 60 * 100 centimeters. The weight of each batch of cargo loaded on a wide body aircraft generally does not exceed 250 kilograms. The general volume should not exceed 250 * 200 * 160 cm. Goods exceeding the weight and volume mentioned above will be collected and transported by Northwest Company based on specific circumstances. Products with a volume exceeding 6000 cubic centimeters per kilogram are calculated as light foam products. Light foam products are measured at 1 kilogram per 6000 cubic centimeters.