Originally Posted by
lewisyu
I spare 3:45 for transit, hopefully it's enough for I&C and TSA.
Plenty of time.
Originally Posted by
lewisyu
About the walk TBIT-T4-T5-T6, can I make use of connector/tunnels?
The tunnels are post-security. If you only have carryon, you could clear security in either TBIT or T6 and then walkway to or escalator down to the tunnels.
I think the tunnels are an interesting experience. Very Cold War bunker-esque. Good way to stretch your legs and get a bit of exercise too.