Local shuttle bus to Hong Kong Airport

Hi,
I remember the following is possible but I cannot remember the details.
Last time I stayed at Best Western Harbourview and took their free airport shuttle and got dropped off I think "Central station".

Afterwards I got off, I took a local bus at one of the street bus stops and it head straight to the airport. It was a long ride but it was cheaper than taking the Airport Express. Would anyone know which bus is it?

Much appreciated for your help