Originally Posted by luv2flyJ
AFAIK even if you don't select a seat the reservation system will select one for you as long as you're not booking a tango fare. Obviously anyone booking in J/C or upgrading would not be booking a tango fare so I don't believe this could be it.
The back-end reservation systems will
not generally assign seats, unless requested by someone (e.g. TA, or Res Agent), or something (e.g. the website booking engine)...