Could we make a page for the cheapest methods to get to Australian airports from the CBD? For example:
Sydney airport
400 bus or walk to/from Mascot station to catch the train to avoid the airport station gate access fees. (Previously this would have had the Opal hack in there.)
Melbourne airport
901 bus to Broadmeadows station and change for a train to the city.
The page could list options for each city/airport, along with the rough time and cost. (And include things like uber, taxi, parking for comparison too.)
Mentioned on the travel wiki page but feel free to create a page yourself.