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don't think so, 35 loops at the bus stop outside the terminal
building, likewise for 90, 94
i think SMRT 177 loops outside mindef also
If u've taken the changi airport services 24, 27, 36, 53, 858 etc
to PTB 1 or 2, u'll notice there is a cisco officer guarding the
entrance to the basement terminal and the barrier will auto-open
for the buses entering the basement. But it's still free access by
any passenger.