RAAF Base Richmond is a Royal Australian Air Force (RAAF) military air base located within the City of Hawkesbury, approximately 50 kilometres (31 mi) North-West of the Sydney Central Business District in New South Wales, Australia. Situated between the towns of Windsor and Richmond, the base is the oldest base in New South Wales and the second oldest in Australia. The base is home to the transport headquarters RAAF Air Lift Group, and its major operational formations, Nos. 84 and 86 Wings. The main aircraft type operated at the base is the Lockheed C-130 Hercules. Richmond is a regular venue for air shows and had at times been mooted as a site for Sydney's proposed second international airport.