The 75S' (which would be used on SFO-JFK) feel older inside than the 75D's, particularly because they didn't install the BSI style pivot bins and mood lighting on the 75S like the 75Ds. Whenever I fly on a refurbished domestic 75D, it feels like a brand new plane inside as the entire plane was pretty much gutted. This is not so much the case on the 75S as only the carpet and seats were really replaced.