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Alibaba,
You can try going to the ASC earlier, as Dee Rod suggests. It all depends on your luck on whether
they allow or not. SFO has been quite liberal in allowing such advance FPs if there is not much crowd. Generally,
going around 3.00 p.m works since it is less crowded then.
By the way, there is no such word in English as "prepone". You either postpone or advance.
Prepone is a contrived word, being used in a colloqial way , mostly in India.