Air cargo containers are the units that freight is packed into before it is loaded onto an aircraft. The industry calls them unit load devices, or ULDs, a term that covers both enclosed containers and flat aircraft pallets with nets. They let airlines load many pieces of freight as one unit, which saves time and protects the freight on the ground and in the air.
ULDs are shaped to fit the curved holds and decks of aircraft, and each aircraft type takes specific units. That is why ocean shipping containers, which are rectangular steel boxes built for ships, trucks and trains, cannot be loaded onto aircraft. Air cargo containers are lighter and shaped to the aircraft instead.
AirFreight.com arranges air freight that travels in these units, from scheduled flights to charters, with trucks collecting and delivering it at each end.