Although this might not be 100% relevant to the subject at hand, I'll give it a shot here.

I have a 20 hour layover and I've been reading about this transfer hotel package for about $100 USD. Does this still exist? Does it have to be booked in advance or can I just show up and book it when I'm there? Do I get off at the arrival terminal instead of the transfer terminal?

I'm in economy (L) so I'm not expecting a free hotel room.

I guess I can get most of this info at the airport before flying out, but I like to be prepared :-)