Hong Kong-based airline Cathay Pacific and subsidiary Cathay Dragon have cancelled hundreds of flights and suspended check-ins for Tuesday.
The airline encourages customers to postpone nonessential travel through at least Wednesday.
Passengers with bookings arriving or departing Hong Kong between August 12-14 can change their flights without charges, as long as they book before August 18. Passengers can also cancel their travel for a full refund. Visit Cathay's site for more details.
Australian airline Qantas cancelled several flights to Hong Kong on Tuesday. The airline has not issued a travel waiver for passengers booked on other flights this week, but suggests that travelers closely monitor flight status.
Lufthansa said that it would rebook passengers who were scheduled to travel on Tuesday, but could not make it through the security checkpoint due to the protests.
The airline still planned its three flights to the city, and did not issue travel waivers. It recommended that passengers continue to check their flight's status prior to heading to the airport.
Air France cancelled its Tuesday night flight from Hong Kong to Paris. It did not provide information about the rest of the week's schedule.
Virgin Atlantic cancelled Tuesday's flights departing Hong Kong, but still planned to operate flights to the city from London Heathrow. It advised travelers to check its travel advisories page for more information.
Hong Kong Airlines cancelled around 20 flights on Tuesday, and advised travelers to monitor its flight status pages. It did not offer travel waivers.
Air China cancelled numerous flights to and from Hong Kong through Wednesday. The airline said it would offer rebookings or refunds to affected passengers.
American Airlines cancelled a flight from Los Angeles to Hong Kong, but planned to operate the rest of its flights. It offered a travel waiver to allow passengers booked to travel August 12-15 to rebook for anytime before August 25.
United issued a travel waiver allowing passengers originally booked for travel from August 12-15 to reschedule it by August 20.