On an All partner award you may change routing, date and time, but NOT carrier at no charge, You cannot, for instance, change JFK-HKG on CX to JFK-NRT-HKG using AA and JL. I just completed an award trip using AA and IB originally routed DFW-MIA-MAD, then changed DFW-JFK-MAD and finally DFW-MEX-MAD all with no change fees.