Very busy international airport because most flights from and to Vietnam have to go through Hanoi city.
Allow a long transit time for the next flight to avoid missing your flight due to the rather complicated immigration process.
There is a free shuttle bus between terminals but there is a schedul
ed departure time
(Have to walk about 5-10 minutes out of the international arrivals terminal to the location of the shuttle bus (which will take us to the domestic terminal)
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