Skybus is expensive to reach Melbourne airport. I took the Metro train from CBD (Flinders Street) to Broadmeadows Station on the Cragieburn line, and then took the 901 bus to the airport (15 minutes ride). All was in public transport and just one trip!
Is there a similar hack available for Sydney airport to CBD transfer where we don't get price gouged for a short ride?
Imagine doing that wth luggage and then hopping on a 16hr flight to somewhere.