Originally Posted by
sscywong
My understanding is they are usually used as op-up buffer. If Y is not full then they will simply keep it empty.
Even you get them before OLCI, they will still put you back to the Y in case Y loading is not as full as they think before... (I had it once few years ago... At least they blocked my next seat for me)
Cheers for the info.
Personally haven't been put back in Y after getting them either at booking/OLCI/counter check-in, and hopefully it won't happen in the future.