how many regional passengers at SYD connect to other services
with some towns having only 1 service a day, eg. SYD/NAA/SYD not going to connect with many international services, so would presume that many NAA originating passengers, are used to idea of having to overnight in Sydney anyway. Who wants to sit at Mascot all day !!!
Bankstown is about a 20 min drive along M5 to Mascot. Thrifty rentals are at Bankstown Airport, just outside main gate on Marion St.
They would probably pick up passengers at the terminal. Think it's less than 1km.
Could do a 24 hour car hire for around $70 dropping off at Mascot. Add about $5-$10 for fuel.