hi, how do I know if I am eligible to use the free shuttle bus to Eaton hotel ? what proof needed ?

Hi, after taking Airport Express to get off at Kowloon Station, you can show the Airport Express train ticket (Single Journey, Same Day Return, Round Trip, Airport Express Travel Pass), Airline ticket / boarding pass, Airport Staff Octopus Card, AsiaWorld-Expo entry pass or event ticket to get on the free shuttle bus line K1 to your hotel directly!