Originally Posted by
FlyMeToTheLooneyBin
I don't think you can easily change terminals via bus inside security either at LAX. Most of the buses require you to have a BP for the terminal you're getting to, and even then, only allow pax on certain carriers on (e.g., QF from T4 to TBIT).
I fly out of LAX quite a bit and this is correct. You will need the appropriate BP to enter the terminal.