Abstract: System for carrying cargo in a passenger aircraft having containers, floor panels, seat tracks, and cargo locks. Containers are dimensioned to pass through a passenger door of an aircraft, fit under the overhead luggage racks of the aircraft and, when one container is positioned on each side of the passenger cabin of the aircraft, leave sufficient space between the containers to permit an aisle of the minimum size required by aviation safety regulations. The containers are sufficiently strong that, when loaded with cargo and fastened in place by the seat tracks and cargo locks, the containers will contain the cargo when subjected to accelerations which containers in passenger compartments must withstand under aviation safety regulations.