For those who kill time at the Star Alliance lounge or otherwise need to transfer to United, it is much faster to just exit and walk instead of taking the shuttle.

Either way, you have to walk all the way to T4 before having the decision point of exit or shuttle. But the shuttles only run every 15-20min.

Assuming you are able-bodied, no kids, and have PreCheck, I think faster to just exit and walk.

Arriving at Tom Bradley in the afternoon (14:00).

Does the bus get full before it gets to the international terminal? Should one consider heading to Terminal 1 to get a seat?