http://www.worldwideflight.com.hk/vip_services.html

"On arrivals, our uniformed Chaperon will be right at the aircraft side as passengers deplane, with a signboard and a warm welcome to Hong Kong. Included in this tailor-made package is the Shuttle, chartered especially for you, standing by for a quick drive to Immigration.

Our Chaperon will continue to escort you through all Government controls, with a Porter waiting to assist with baggage claim. The Chaperon will remain at your side until meeting your representative in the Meet and Greet area, or right through to ground transportation. "

The cost does not seem to be shown on the website.