Depending on the characteristics of the container, but air transport is a very high cost per unit. Many infrastructure needs to support both air freight system.
Depending on the nature of the container only. But the air transport cost per unit is very high. Infrastructure needs to support many forms of air cargo system.
However, with the appearance of the container as the core. But transportation cost per unit is very high. A lot of infrastructure needs to support the model of air transportation system.