Originally Posted by
Eastbay1K
Wrong. You cannot get to 2 from 3.
Also, if the OP is arriving in International-G on an international flight, and it's not among the handful of flights that have CBP pre-clearance through Immigration, then the OP is not really arriving in I-G at all. Exiting through Customs is required, and the OP will end up landside in the Immigration Terminal.