Regarding the upgrade issue with J being available and TK only offering cash upgrade option vs Miles: Had this happen to me last week trying to upgrade my flight out of Delhi. Plenty of J available but the call center insisted it was only for cash upgrade, not Miles. Was finally able to use Miles at checkin after it was apparent they would not sell all the space. Flight left half empty in J. Obviously they are trying to monetize as much as possible. Looks like they have been paying attention to other airlines