Originally Posted by
Eastbay1K
FYI, one has been able transit airside between T8 all the way through to TBIT for several years now. T8-7-6 are all at the start of each pier, just past the security checkpoints, 6-5-4 are mid-terminal tunnels, and 4-TBIT is an airside bridge.
It's a 25-30min walk airside from TBIT to 8!