In 1933, the first gravel runways were built. The course of Cooks River was moved away from the area in 1947–52 to provide more land for the airport and other small streams were filled. When Mascot was declared an aerodrome in 1920 it was known as Sydney Airport. In 1953 it was renamed Sydney (Kingsford Smith) Airport after Charles Kingsford Smith, a pioneering Australian aviator. The first paved runway was 07–25 and the next one built was 16R, sticking out into Botany Bay, starting in 1959, to land large jets. 07-25 is used mainly by lighter aircraft, although large four engine jet aircraft still land on the runway from the east, when south-westerly winds are blowing in Sydney. 16R is presently the longest operational runway in Australia, with paved length and between the zebra thresholds.