I currently have an award business ticket on AA and CX from LGA-YYZ-HKG, then HKG-JFK. Am I allowed to change my outbound flight to JFK-HKG w/o a change fee? Does up-faring to first class help? Also, if I might end up paying a change fee anyway, am I allowed to change the return leg to HKG-JFK (stopover)-ORD, and save the JFK-ORD leg for a later date? Thanks!