Once thought of as a means to speed perishables or expensive but light products, air freight now uses high-speed supercargo planes, developed for military operations, to move bulk goods.

• 过去曾经认为；飞机只能空运那些易于腐烂或价值昂贵而重量较轻的货物；而现在则可利用为军事用途而发展起来的高速载重飞机运送大宗货物.