Join Date: Dec 2005
Location: NYC
Programs: SPG, AA, BA, CO, UA, US, B6, DL, Amex MR, HH
Posts: 1,009
Could also depend on if the EMS seat was originally purchased with the original itinerary or as an add-on after booking.
As a data point, I had an EMS that was originally booked (with points) on the initial itinerary, and on check-in all the other EMS seats were showing $0.