The mileage calculation is per "direct" flight. A direct flight is one with a single flight number and may include one or more stops. but if you do not continue on the same flight (same flight number, same day), it is not a direct flight.

So if you take CX from USA (LAX, SFO, YVR, JFK etc) to HGK and then connect to a different CX flight number to NRT, that is two sectors and the mileage is the sum of USA-HKG + HKG-NRT.

The CX flight that goes JFK-YVR-HKG is a single flight number, so in that case if you board in JFK and onlt transit in YVR and end in HKG, that is a "direct" flight JFK-HKG and mileage is calculated as JFK-HKG only.

I don't know of any CX flights that continue through HKG (ie start outside HKG, fly to HKG and continue to another destination beyond HKG). As far as I can tell, all CX flights either originate from or terminate at HKG. There are some, such as the YVR/JFK flight described above, that continue through other destinations.

As for stopovers, here are the restrictions:

• Max four stopovers for 22,000 miles fare
• Max five stopovers for 26,000 miles fare
• Max six stopovers for 29,000 mile fare
• Max one stopover at any one point
• Max one stopover in country of origin
• Max two free stopovers in any region
• Surface sectors are considered one stopover
• Additional stopovers can be purchased at US$75, max two per region, none in country of origin
• A stopover is a connection between two flight sectors that spans 24 hours or more.