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[Read how the protests have put Hong Kong on a collision course with the Communist Party.]

They have since morphed into calls for more direct elections, a call for Mrs. Lam to resign and an investigation of the police, among other demands.

Beijing, which views the unrest as a direct challenge to its authority, has warned the protesters to stop and has leaned on Hong Kong’s political and business elite to close ranks behind Mrs. Lam, a career civil servant.

Much of the pressure on the business community has focused in recent days on Cathay Pacific, one of the territory’s best-known international brands. The Chinese government has forced it to bar staffers who support or participate in the protests from doing any work involving flights to mainland China.

On Tuesday afternoon, Rupert Hogg, the airline’s chief executive, warned employees against participating in Tuesday’s airport demonstration because it was not sanctioned by the government.

“It is important that you do not support or participate in this protest,” Mr. Hogg said in an internal email. “Again, we would be concerned about your safety if this protest becomes disorderly or violent.” Cathay also said on Tuesday that it had suspended an officer for misusing company information the day before.