You may also pre-e book a taxi to collect you from your airport. Pre-booked parking bays are available on the international and domestic terminals. The sole time I'd personally stay away from the train will be the early early morning peak – say seven.30am-8.50am when trains usually are seriously crowded, https://sydneyairporttaxi83680.dgbloggers.com/31389549/the-2-minute-rule-for-sydney-international-airport-taxi-limousine