A traveler leans on her bag while browsing her smartphone at the departure hall of the Hong Kong International airport on Monday, Aug. 12, 2019. One of the world's busiest airports canceled all flights after thousands of pro-democracy demonstrators crowded into Hong Kong's main terminal Monday, while the central government in Beijing issued an ominous characterization of the protest movement as something approaching "terrorism." (AP Photo/Vincent Thian), APTOPIX

Stranded travelers from China, left, and Russia sit on the check-in counters at the Hong Kong International Airport, Monday, Aug. 12, 2019. One of the world's busiest airports canceled all flights after thousands of Hong Kong pro-democracy protesters crowded into the main terminal Monday afternoon. (AP Photo/Kin Cheung)

Protesters gather near an information board during a protest at the Hong Kong International Airport, Monday, Aug. 12, 2019. One of the world's busiest airports canceled all flights after thousands of Hong Kong pro-democracy protesters crowded into the main terminal Monday afternoon. (AP Photo/Kin Cheung)

Protesters sleep during a protest at the Hong Kong International Airport, Monday, Aug. 12, 2019. One of the world's busiest airports canceled all flights after thousands of Hong Kong pro-democracy protesters crowded into the main terminal Monday afternoon. (AP Photo/Kin Cheung)

Stranded travelers sit in the check-in counters at the Hong Kong International Airport, Monday, Aug. 12, 2019. One of the world's busiest airports canceled all flights after thousands of Hong Kong pro-democracy protesters crowded into the main terminal Monday afternoon. (AP Photo/Kin Cheung)

Stranded travelers sleep at the check-in counters at the Hong Kong International Airport, Monday, Aug. 12, 2019. One of the world's busiest airports canceled all flights after thousands of Hong Kong pro-democracy protesters crowded into the main terminal Monday afternoon. (AP Photo/Kin Cheung)

A protester makes a birthday wish during a protest at the Hong Kong International Airport, Monday, Aug. 12, 2019. One of the world's busiest airports canceled all flights after thousands of Hong Kong pro-democracy protesters crowded into the main terminal Monday afternoon. (AP Photo/Kin Cheung)

Protesters walk on a highway near Hong Kong's international airport following a protest against the police brutality and the controversial extradition bill on August 12, 2019. - Hong Kong airport authorities cancelled all remaining departing and arriving flights at the major travel hub on August 12, after thousands of protesters entered the arrivals hall to stage a demonstration. (Photo by Vivek Prakash / AFP)

Protesters walk on a highway near Hong Kong's international airport following a protest against the police brutality and the controversial extradition bill on August 12, 2019. - Hong Kong airport authorities cancelled all remaining departing and arriving flights at the major travel hub on August 12, after thousands of protesters entered the arrivals hall to stage a demonstration. (Photo by Vivek Prakash / AFP)

Protesters walk on a highway near Hong Kong's international airport following a protest against the police brutality and the controversial extradition bill on August 12, 2019. - Hong Kong airport authorities cancelled all remaining departing and arriving flights at the major travel hub on August 12, after thousands of protesters entered the arrivals hall to stage a demonstration. (Photo by Vivek Prakash / AFP)

Protesters walk on a highway near Hong Kong's international airport following a protest against the police brutality and the controversial extradition bill on August 12, 2019. - Hong Kong airport authorities cancelled all remaining departing and arriving flights at the major travel hub on August 12, after thousands of protesters entered the arrivals hall to stage a demonstration. (Photo by Vivek Prakash / AFP)

Protesters walk on a highway near Hong Kong's international airport following a protest against the police brutality and the controversial extradition bill on August 12, 2019. - Hong Kong airport authorities cancelled all remaining departing and arriving flights at the major travel hub on August 12, after thousands of protesters entered the arrivals hall to stage a demonstration. (Photo by Vivek Prakash / AFP)

Protesters walk on a highway near Hong Kong's international airport following a protest against the police brutality and the controversial extradition bill on August 12, 2019. - Hong Kong airport authorities cancelled all remaining departing and arriving flights at the major travel hub on August 12, after thousands of protesters entered the arrivals hall to stage a demonstration. (Photo by Vivek Prakash / AFP)

Protesters rest at Hong Kong'S International airport during a protest against the police brutality and the controversial extradition bill on August 12, 2019. - Hong Kong airport authorities cancelled all remaining departing and arriving flights at the major travel hub on August 12, after thousands of protesters entered the arrivals hall to stage a demonstration. (Photo by Philip FONG / AFP)

Protesters line up for a train at airport station after a protest against police brutality and the controversial extradition bill on August 12, 2019. - Hong Kong airport authorities cancelled all remaining departing and arriving flights at the major travel hub on August 12, after thousands of protesters entered the arrivals hall to stage a demonstration. (Photo by Philip FONG / AFP)

Protesters stand inside a MTR train at airport station after a protest against the police brutality and the controversial extradition bill on August 12, 2019. - Hong Kong airport authorities cancelled all remaining departing and arriving flights at the major travel hub on August 12, after thousands of protesters entered the arrivals hall to stage a demonstration. (Photo by Philip FONG / AFP)

Protesters line up at the airport MTR station following a protest against police brutality and the controversial extradition bill on August 12, 2019. - Hong Kong airport authorities cancelled all remaining departing and arriving flights at the major travel hub on August 12, after thousands of protesters entered the arrivals hall to stage a demonstration. (Photo by Philip FONG / AFP)

Protesters walk on a highway near Hong Kong's international airport following a protest against the police brutality and the controversial extradition bill on August 12, 2019. - Hong Kong airport authorities cancelled all remaining departing and arriving flights at the major travel hub on August 12, after thousands of protesters entered the arrivals hall to stage a demonstration. (Photo by Philip FONG / AFP)

Protesters walk on a highway near Hong Kong's international airport following a protest against the police brutality and the controversial extradition bill on August 12, 2019. - Hong Kong airport authorities cancelled all remaining departing and arriving flights at the major travel hub on August 12, after thousands of protesters entered the arrivals hall to stage a demonstration. (Photo by Philip FONG / AFP)

Protesters walk on a highway near Hong Kong's international airport following a protest against the police brutality and the controversial extradition bill on August 12, 2019. - Hong Kong airport authorities cancelled all remaining departing and arriving flights at the major travel hub on August 12, after thousands of protesters entered the arrivals hall to stage a demonstration. (Photo by Vivek Prakash / AFP)

A stranded passenger pushes his luggage among protesters walking on a highway near Hong Kong's international airport following a protest against the police brutality and the controversial extradition bill on August 12, 2019. - Hong Kong airport authorities cancelled all remaining departing and arriving flights at the major travel hub on August 12, after thousands of protesters entered the arrivals hall to stage a demonstration. (Photo by VIVEK PRAKASH / AFP)

A stranded passenger pushes his luggage among protesters walking on a highway near Hong Kong's international airport following a protest against the police brutality and the controversial extradition bill on August 12, 2019. - Hong Kong airport authorities cancelled all remaining departing and arriving flights at the major travel hub on August 12, after thousands of protesters entered the arrivals hall to stage a demonstration. (Photo by VIVEK PRAKASH / AFP)

A stranded passenger (C) wheels her luggage along on a highway near Hong Kong's international airport following a protest against the police brutality and the controversial extradition bill on August 12, 2019. - Hong Kong airport authorities cancelled all remaining departing and arriving flights at the major travel hub on August 12, after thousands of protesters entered the arrivals hall to stage a demonstration. (Photo by VIVEK PRAKASH / AFP)

A stranded passenger wheels her luggage along on a highway near Hong Kong's international airport following a protest against the police brutality and the controversial extradition bill on August 12, 2019. - Hong Kong airport authorities cancelled all remaining departing and arriving flights at the major travel hub on August 12, after thousands of protesters entered the arrivals hall to stage a demonstration. (Photo by VIVEK PRAKASH / AFP)

Protesters walk on a highway near Hong Kong's international airport following a protest against the police brutality and the controversial extradition bill on August 12, 2019. - Hong Kong airport authorities cancelled all remaining departing and arriving flights at the major travel hub on August 12, after thousands of protesters entered the arrivals hall to stage a demonstration. (Photo by VIVEK PRAKASH / AFP)

Protesters walk on a highway near Hong Kong's international airport following a protest against the police brutality and the controversial extradition bill on August 12, 2019. - Hong Kong airport authorities cancelled all remaining departing and arriving flights at the major travel hub on August 12, after thousands of protesters entered the arrivals hall to stage a demonstration. (Photo by VIVEK PRAKASH / AFP)

Protesters walk on a highway near Hong Kong's international airport following a protest against the police brutality and the controversial extradition bill on August 12, 2019. - Hong Kong airport authorities cancelled all remaining departing and arriving flights at the major travel hub on August 12, after thousands of protesters entered the arrivals hall to stage a demonstration. (Photo by VIVEK PRAKASH / AFP)

Protesters walk on a highway near Hong Kong's international airport following a protest against the police brutality and the controversial extradition bill on August 12, 2019. - Hong Kong airport authorities cancelled all remaining departing and arriving flights at the major travel hub on August 12, after thousands of protesters entered the arrivals hall to stage a demonstration. (Photo by VIVEK PRAKASH / AFP)

Protesters walk on a highway near Hong Kong's international airport following a protest against the police brutality and the controversial extradition bill on August 12, 2019. - Hong Kong airport authorities cancelled all remaining departing and arriving flights at the major travel hub on August 12, after thousands of protesters entered the arrivals hall to stage a demonstration. (Photo by VIVEK PRAKASH / AFP)

Protesters walk on a highway near Hong Kong's international airport following a protest against the police brutality and the controversial extradition bill on August 12, 2019. - Hong Kong airport authorities cancelled all remaining departing and arriving flights at the major travel hub on August 12, after thousands of protesters entered the arrivals hall to stage a demonstration. (Photo by VIVEK PRAKASH / AFP)

Protesters walk on a highway near Hong Kong's international airport following a protest against the police brutality and the controversial extradition bill on August 12, 2019. - Hong Kong airport authorities cancelled all remaining departing and arriving flights at the major travel hub on August 12, after thousands of protesters entered the arrivals hall to stage a demonstration. (Photo by VIVEK PRAKASH / AFP)

Stranded passengers try to get help at a customer service counter after all flights were cancelled at Hong Kong's international airport following a protest against the police brutality and the controversial extradition bill on August 12, 2019. - Hong Kong airport authorities cancelled all remaining departing and arriving flights at the major travel hub on August 12, after thousands of protesters entered the arrivals hall to stage a demonstration. (Photo by VIVEK PRAKASH / AFP)

Stranded passengers look at a flight information board after all flights were cancelled at Hong Kong's international airport following a protest against the police brutality and the controversial extradition bill on August 12, 2019 - Hong Kong airport authorities cancelled all remaining departing and arriving flights at the major travel hub on August 12, after thousands of protesters entered the arrivals hall to stage a demonstration. (Photo by VIVEK PRAKASH / AFP)

A flight information board shows cancelled flights at Hong Kong's international airport following a protest against the police brutality and the controversial extradition bill on August 12, 2019. - Hong Kong airport authorities cancelled all remaining departing and arriving flights at the major travel hub on August 12, after thousands of protesters entered the arrivals hall to stage a demonstration. (Photo by VIVEK PRAKASH / AFP)

A flight information board shows cancelled flights at Hong Kong's international airport following a protest against the police brutality and the controversial extradition bill on August 12, 2019. - Hong Kong airport authorities cancelled all remaining departing and arriving flights at the major travel hub on August 12, after thousands of protesters entered the arrivals hall to stage a demonstration. (Photo by VIVEK PRAKASH / AFP)

A protester rests at Hong Kong's International airport following a protest against the police brutality and the controversial extradition bill on August 12, 2019. - Hong Kong airport authorities cancelled all remaining departing and arriving flights at the major travel hub on August 12, after thousands of protesters entered the arrivals hall to stage a demonstration. (Photo by Philip FONG / AFP)

Protesters rest at Hong Kong's International airport during a protest against the police brutality and the controversial extradition bill on August 12, 2019. - Hong Kong airport authorities cancelled all remaining departing and arriving flights at the major travel hub on August 12, after thousands of protesters entered the arrivals hall to stage a demonstration. (Photo by Philip FONG / AFP)

A tourist stands in front of a Hong Kong flag at Hong Kong's international airport after a protest against the police brutality and the controversial extradition bill on August 12, 2019. - Hong Kong airport authorities cancelled all remaining departing and arriving flights at the major travel hub on August 12, after thousands of protesters entered the arrivals hall to stage a demonstration. (Photo by Philip FONG / AFP)

Protesters stick memos outside a lift at Hong Kong international airport as a tourist (R) stands inside after a protest against the police brutality and the controversial extradition bill on August 12, 2019. - Hong Kong airport authorities cancelled all remaining departing and arriving flights at the major travel hub on August 12, after thousands of protesters entered the arrivals hall to stage a demonstration. (Photo by Philip FONG / AFP)