I have done ML to BOG this year and have flown on the updated version, the classic version all in J, and now in February, I am scheduled to fly the SQ version in PY. fares dropped by $300 each way so I canceled the Y flight for the PY flight and made sure I am on the 77W out of YVR so I am in PY all the way! May upgrade the YVR/YVR portion to J.