Originally Posted by
Mrtnw
True, but OPs question stated "when flying J always". So unless he wants to buy Y and use AM to upgrade to J this isn't relevant to her/him
I think being able to buy J/C class on a sold out flight apply to OP in this case.
say you wanted to fly on CNY your parent got in accident and in critical condition. Having a DM status with guranteed seat in J/C makes the difference to be able to see your parent or not.