Travellers arriving at Phu Quoc (PQC) international airport are permitted a maximum stay of 30 days. Travellers
arriving at Hanoi (HAN) or Ho Chi Minh City (SGN) international airports, with onward tickets for a connecting flight, on the same day, to Phu Quoc (PQC)
must clear immigration at Hanoi (HAN) or Ho Chi Minh City (SGN) where they will be granted a maximum stay of 30 days and transfer to domestic terminal
for a connecting flight to Phu Quoc (PQC).
U.S. policy on dual nationality can be found