jAAk,
why not start your trip by buying a seperate LGA - YYZ flight on AA and then get to HKG via YYZ. You can save close to 20 percent by originating your RTW in Canada. In addition the YYZ - HKG flight is offering a 20,000 mile bonus vs. 10,000 on JFK-HKG. As a final plus the YYZ-HKG flights are far easier to get in A class then the JFK - HKG flight!!
rich