The authority said the action, aimed specifically at the airport, could lead to delays and passengers should keep an eye on the latest developments.
The advert also warns that anybody who tries to undermine the airport’s operations will be at risk of violating a court injunction prohibiting protests at the site.
It also notes that if flights are disrupted, the city’s economy will suffer.
Hundreds of flights were grounded on August 13 and 14 when anti-government protesters staged a major sit-in at the airport.
Over the previous few days, they had been greeting passengers in the arrivals halls, explaining the reasons for the ongoing extradition bill protests to visitors from overseas.
But the protest later spread to the departures hall, prompting the authorities to cancel flights.