Passengers wait in front of closed security gates as anti-extradition bill demonstrators protest at the departure hall of Hong Kong Airport, China August 12, 2019. Hong Kong's airport said on Tuesday it will implement flight rescheduling, with flight movements expected to be affected, after China said widespread anti-government protests that halted flights a day earlier showed "sprouts of terrorism". REUTERS/Issei Kato

Passengers rest at the check-in counters in the departure hall after flights were cancelled during the anti-extradition bill protest at Hong Kong Airport, China August 12, 2019. The airport, one of the world's busiest, blamed demonstrators for halting flights on Monday. REUTERS/Issei Kato

Passengers look at the departure board after all flights leaving Hong Kong were cancelled due to a protest inside the airport terminal in Hong Kong, China August 12, 2019. Hong Kong is the world's busiest air cargo port and the 8th busiest by passenger traffic, handling 73 million passengers a year. REUTERS/Thomas Peter

Passengers rest at the check-in counters after all flights were cancelled due to a protest inside the airport terminal in Hong Kong, China August 12, 2019. REUTERS/Thomas Peter

Passengers rest at the check-in counters after all flights were cancelled due to a protest inside the airport terminal in Hong Kong, China August 12, 2019. REUTERS/Thomas Peter

A passenger waits at the departure hall as anti-extradition bill protesters rally at of Hong Kong airport in Hong Kong, China August 12, 2019. REUTERS/Thomas Peter