Los Angeles is one of the largest container gateways in the United States, and many calls are liner services working to fixed berth windows. When a vessel is only alongside for a short time, stores need to be quoted, packed, and cleared for terminal entry before arrival. Sending the requisition several days ahead of ETA gives the most options.
The port also handles tankers at liquid bulk terminals, along with breakbulk, Ro-Ro, and cruise traffic, each with its own terminal rules.