The 420 bus providers Sydney Airport, but this doesn’t run to or within the CBD. The 420 operates as much as Mascot, or Burwood in the other path. You will take a bus from Sydney Airport to Mascot and connect to the City by using coach as we’ve outlined previously https://paxtonslcsz.hazeronwiki.com/7370719/the_sydney_international_airport_taxi_limousine_diaries