SilkAir Singapore Private Limited, operating as SilkAir, was a Singaporean regional airline with its head office in Changi, Singapore. It was a wholly owned subsidiary of Singapore Airlines and in 2017, operated scheduled passenger services from Singapore to 54 cities in Southeast Asia, the Indian subcontinent, East Asia, and Northern Australia. As the regional wing of Singapore Airlines, it served the short to medium-haul destinations in the Singapore Airlines Group network.
SOURCE: Wikipedia