We are flying Qantas domestic from Adelaide to Sydney then flying Jetstar international. I understand we will need to get a transfer from domestic terminal to international. Does Qantas allow you to use their shuttle if you fly Jetstar? (I'm thinking no?) There are 5 of us so looking at the costs of train/bus/taxi it would appear cheaper to get a taxi but do they have taxi's that can accommodate all 5 of us at once??