Originally Posted by
Jainzar
N is the cheapest PE booking class, so it is not at all strange that you can't upgrade. It is strange that according to the list also the other 2 PE booking classes are not eligible. For SQ they have PE included nowadays.
Since the upgradable booking classes for each airline are the same for each partner, I would expect that the operating carrier communicates what classes are applicable. Though it still makes me wonder why Lufti excluded PY.