The central government in Beijing ominously characterized the current protest movement as something approaching "terrorism."
Demonstrations began early last month in opposition to an extradition bill that has since been suspended, but the movement has become a push for full democracy.
Demonstrators took to the streets again on Sunday, chanting "Free Hong Kong" and demanding the resignation of the city's leader.
Protesters oppose the government-backed legislation that would allow people to be extradited to mainland China to face charges.
The 34-mile bridge connects the semi-autonomous regions of Hong Kong and Macau to the Chinese mainland.
The plane was carrying out a routine mission over the South China Sea, according to an Air Force official.
More importantly, what took centuries and a Great Wall to build ages ago might be accomplished almost overnight in the information
The three state-owned companies had not raised complaints because they knew the decision had been endorsed by Chinese leadership