From that very article: “However, since plug doors must open inward, the design is disadvantageous for cargo doors. Due to its large area, the cargo door on an

From that very article: “However, since plug doors must open inward, the design is disadvantageous for cargo doors. Due to its large area, the cargo door on an airliner cannot be swung inside the fuselage without taking up a considerable amount of valuable cargo space. For this reason, these doors often open outward and use a locking mechanism with multiple pins or hatch dogs to prevent opening while in flight.”