airline as to whether such transfers are allowed. The 787, intended to replace the 767, was designed to use the LD3/6/11 family of ULDs to solve the wasted volume issue. ULD capacity Aircraft loads can consist of containers, pallets, or a mix of ULD types, depending on requirements. In some aircraft the two types must be mixed as some compartments take only specific ULDs. Container capacity of an aircraft is measured in positions. Each half-width container (LD1/LD2/LD3) in the aircraft it was designed for occupies one position. Typically, each row in a cargo compartment consists of two positions. Therefore, a full-width container (LD6/LD8/LD11) will take two positions. An LD6 or an LD11 can occupy the space of two LD3s. An LD8 takes the space of two LD2s. Aircraft pallet capacity is measured by how many PMC-type LD7s can be stored. These pallets occupy approximately three LD3 positions (two positions of one row and half of the two positions of the following row) or four LD2 positions. PMCs can only be loaded in cargo compartments with large doors designed to accept them (small door compartments are container-only). Identification All ULDs are identified by their ULD number. A three-letter prefix identifies its type and key characteristics, followed by a 4 or 5 digit serial number (4 if prior to October 1, 1993; either 4 or 5 if after October 1, 1993) to uniquely identify it from others of the same type, and ending with a two character (alpha-numerical) suffix identifying the ULD's owner (if an airline, often the same as IATA designator codes). For example, AKN 12345 DL means that the ULD is a forkliftable LD3 with the unique number 12345 and its owner is Delta Air Lines. Notes Common prefixes AAA: LD7 container (), tall, contoured for maindeck narrow-body AAD: LD7 container (), tall, contoured for maindeck wide-body (aka A1) AAF: LD26 container AAP: LD9 AAU: LD29 container AAY: LD7 container (), tall, contoured for maindeck wide-body and narrow-body (aka A2) AAZ: LD7 container (), tall, contoured for maindeck wide-body and narrow-body and any belly (aka L9) AGA: M2 container AKC: LD1 without forklift holes AKE: LD3 without forklift holes/half ALF AKH, AKW: LD3-45 mainly for A320/321, tall, same base as AKE, extensions on both sides AKN: LD3 with forklift holes ALB: LD4 with forklift holes ALD: LD11 container (aka L11) ALF: LD6 without forklift holes ALP: LD11 without forklift holes