Asia Miles are the most popular air miles program available in Hong Kong. Most cards have a partnership with Asia Miles so they earn air miles for this program for every purchase made with their cards.
Another air miles program common in Hong Kong is Japan Airline's ANA Miles. While it may come off as expensive, it has great value for group or family travels.
Other air miles programs include KrisFlyer, Avios, and United Airlines' MileagePlus.