Unit load devices (ULD) come in several dimensions and are
designed to fit the bellyhold of a jet plane, particularly
wide-bodied aircrafts. The number of containers that can
be fitted is a function of the length of the cargo area.
The loading of ULDs is rather simple as it involves rolling
in the container. 32 such ULD can be loaded in a 747-400.
ULDs offer several advantages:
The main drawback is that ULDs can only by used for
air cargo operations and a transfer to another mode
(trucking) requires consolidating or deconsolidating the
- They use standardized sizes and equipment that
fit in most commercial aircrafts.
- Faster handling (loading and unloading) and
tracking of the cargo.