Originally Posted by
CPH-Flyer
I asked in August 2015, exactly as I was going from AA to AA. Interestingly enough, LAX's own map does not mention it either though the 4 to TBIT is mentioned. But excellent to know for the next hike from T6.
LAX maps from LAX:
http://www.lawa.org/welcome_lax.aspx?id=256
Various parts of it reopened in 2014 and 2015, see
lax t4-t5 tunnel FT thread for example.
It is definitely less polished than the underground passageways at LHR T5, and feels more like a service tunnel. There are no moving walkways for example. Still, it is a nicer option than reclearing security!
LAX had talked about connecting all terminals in this way, but with the uncertainty of how T1-T3 might get rebuilt, that side of the airport is on hold for now.