Very clever Qantas: The age demographic on International departures only - noting it doesn't allow on return journey eg: LAX, SIN etc. But will hopefully be enough of a carrot to dangle to entice them to book Qantas / Oneworld airfares on the same ticket.

the best as far as affordable and within walking distance,Domestic - try Stamford PlazaInternational - try Mercure

The AA Lounge in Terminal D has best view. All of the AA Admirals lounges have food / wine available with 2 vouchers that you get upon entry. You'll find the high ceilings and sunset while waiting for your flight quite picturesque. 

You will have to talk to them on a case by case basis. In the past i have been changed from A380 onto 747 when there was a change of aircraft, however their recommendation was to get to the airport as early as possible to get seat allocation. Yes they should respect the 'paid seat selection' and ...

Stamford Grand at Glenelg would be around 5 mins drive, or even a city hotel like Rydges, Hilton, InterContinental etc would only be 10-12 mins drive that time of evening and early morning.Regarding the QantasClub, its just standard domestic lounge so thats as good as you'll expect, however it on...