Be careful. If you book say XXX - HKG - YYY on AM redemption, the website will immediately give you CONNECTING flights, meaning arrival into HKG and departure from HKG are within 24 hours.

Once the ticket is issued and you want to now STOPOVER in HKG for more than 24 hours by changing either the inbound or outbound segments or both - this will necessitate a REISSUANCE that costs 10,000 AM or US$100 and not just a simple REBOOKING that costs 1,000 AM or US$25.

Same if you are to change in reverse from connecting flights over 24 hours to those that are within 24 hours.