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Timatic, which is the database that airlines use to verify your travel documents, still states today that you can transit without a visa for a layover up to 24 hours.
Visa required, except for Passengers with a confirmed onward ticket for a flight to a third country within 24 hours. They must stay in the international transit area of the airport and have documents required for the next destination. (SEE NOTE 88975)
- This TWOV facility does not apply at Fuzhou (FOC), Huangshan (TXN), Mudanjiang (MDG), Shenzhen (SZX), Urumqi (URC) and Yanji (YNJ).
NOTE 88975: This TWOV facility does not apply when passengers arrive on a direct flight from USA, Guam or Northern Mariana Isl. AND depart on a direct flight to USA, Guam or Northern Mariana Isl. (e.g. JFK - PVG - GUM).