My family will arrive LAX T8 by United Airlines, and then they will take Southwest at T1. and they need to pass Custom at T8.
I'm not sure how long time is needed from LAX T8 to T1. Do they need to take shuttle or they could go to T1 by step? The United flight will arrive at 5:15pm, is there any risk if they book the Southwest flight depart at 9:10pm?