As activists planned to besiege the aviation hub, railway operator the MTR Corporation announced trains on the Airport Express rail link would only ply from the Hong Kong station to the airport - bypassing Kowloon and Tsing Yi stations, while skipping AsiaWorld Expo - from Saturday morning onwards, reports the South China Morning Post.
The pre-emptive measures came as protesters made plans to ditch their trademark black T-shirts and gear to better blend in with travellers, and forge boarding passes to get into the airport.
Hong Kong police and the Airport Authority warned against such acts by the anti-government protesters, saying any deliberate obstruction or attempts to use fake boarding passes could have legal consequences.
Anyone found using fake tickets could be charged with forgery and face up to 14 years in prison.
On Sunday, another demonstration will be held in Chater Garden, then marching to the US.
The rally aims to call for the passage of the Hong Kong Human Rights and Democracy Act, which would allow US authorities to sanction officials who suppress Hongkongers' human rights.
About 5,000 people were expected to attend, according to the police.
Anti-government anger sparked by the now-shelved extradition bill, which would have allowed criminal suspects to be sent to jurisdictions including mainland China, has fuelled protests in Hong Kong since June.
Demonstrators have five main demands for the city's leader Carrie Lam, including formally withdrawing the bill, establishing a commission of inquiry to investigate police conduct and and restarting the city's stalled political reform process.
( With inputs from IANS )