Originally Posted by
mitparekh
Here is the itinerary:
CX 845 - JFK-HKG - Class M
CX 755 - HKG-BKK - Class M
Return:
CX 702 - BKK-HKG - Class M
CX 888 - HKG-JFK (via YVR) - Class M
Long story short, M class can only upgrade to premium economy. Period. All flights to/from JFK have premium economy so you're just not going to be able to upgrade to business, unfortunately.