HKIA = Hong Kong International Airport
HKTB = Hong Kong Tourism Board
Below is the replied from them..
Dear Ms Chu,
Thank you for your email. Please rest assured we are most concerned about your comment on wheelchair staff accepted tips from passenger. As there are different wheelchair service providers in the airport, to let us understand more about the matter, we would be grateful if you could advise us the airline that the old lady travelled with, a brief description of the staff concerned and her uniform colour. Your additional information may facilitate our follow up with relevant service provider. Should you have any queries, please feel free to contact us.
Once again, thank you for writing to us.
Yours sincerely,
Customer Service
Hong Kong International Airport
c.c. Hong Kong Tourism Board (Case Ref No. FEED-VRSUP3-20110310-0226575)