The central government in Beijing characterised the protest movement posed an "existential threat" to local citizens.
Stranded travelers check their flights information.
Police and protesters clashed at Hong Kong's worldwide airport on Tuesday evening after flights were disrupted for a second day and the political crisis in the former British colony deepened. All Cathay Pacific crew members flying to the mainland will have to submit their identification details to Chinese authorities for approval before flights can proceed, it said.
They chanted: "stand with Hong Kong, stand for freedom", as passengers scrambling to catch rescheduled and delayed flights wheeled their luggage through the airport.
It came a day after authorities announced the unprecedented complete cancellation of all arriving and departing flights over a massive rally.
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"In terms of withdrawing the bill, using this specific term, which the protesters have called for, do you as Hong Kong's leader have the autonomy to decide to withdraw the bill, yes or no, or is this something that Beijing has to approve as well?"
As she spoke, the benchmark Hang Seng index hit a seven-month low.
By lunchtime, it had dropped almost 2 per cent, dragging down markets across Asia.
The latest protests were sparked by an extradition law that would have allowed some people accused of crimes in Hong Kong to be tried in mainland China.
"They can do what they want but it should not affect other people".
While the delays had been frustrating, she said travellers weren't blaming the protesters.
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"My responsibility goes beyond this particular range of protest", she said, adding that violence had pushed the territory into a state of "panic and chaos". "It touched me to see Hong Kong like this, I'm not angry", a 31-year-old passenger, who asked not to be identified, told CNN.
During the weekend protests, website Hong Kong Free Press showed footage of one arrest that appeared to include officers in plain clothes pinning a demonstrator pressed to the ground.
That includes United Airlines flights that connect Hong Kong to Newark Airport and JFK.
President Donald Trump said reports from USA intelligence agencies shows the Chinese government is moving troops to its border with Hong Kong.
Amid the disruptions due to protests at Hong Kong airports, Cathay Pacific halted check-ins citing "potential for new disruptions".
But he said he sympathised with the protesters despite the disruption. The airline warned passengers in a travel advisory that the impact could last until Tuesday morning.
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In a statement , the USTR indicated that the decision was a "part of USTR's public comment and hearing process". With the latest delay in tariffs, once again there were renewed hopes in markets of a resolution to the U.S.
The official state news agency Xinhua said in a commentary Tuesday that "violent radicals" were pushing Hong Kong into an "abyss".