You are also out of luck.
Unless you have a friendly face and a degree of chutzpah. See someone making a bee line to the door and politely saw you are going to SYD and want to do some laptop work before you go, and would that person object to taking you in as his guest. If it were me, I'd OFFER to buy him/her a drink, but that is for you to decide. 5 bucks for possible RCC access is a good deal. This getting signed in deal often works many have reported here in the past.
What is your fly date? Some here (coff) are flying LAX-SYD in the not too distant future.
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Glen ~
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