I will be departing SYD on AA 72 for LAX and will be in business class. I will be staying the night before at Sydney Marriott at Circular Quay. Is it okay for me to leave the Marriott by taxi at 7:15 am to make it comfortably on the flight? I believe there is express immigration clearance for Business Class passengers or am I mistaken? Should I be leaving earlier or is 7:15 am departure from Marriott reasonable? Thanks.