SF Express (Group) Co., Ltd. (Chinese: 顺丰速运(集团)有限公司; pinyin: Shùnfēng Sùyùn (Jítuán) Yǒuxiàn Gōngsī) is a Chinese delivery services company based in Shenzhen, Guangdong, China. It is one of the two leading couriers in China, and provides domestic and international express delivery solutions to a wide array of customers. SF Express has a fleet of 31 cargo aircraft, of which 13 are owned by its subsidiary SF Airlines.