Just to be clear, IFE = inflight entertainment. All of DL's 767s have IFE; I believe you are referring to AVOD PTVs in Y on DL's 767s. Right now, 7 of Delta's 767-300ERs are equipped with AVOD PTVs in Economy; you can identify them by the Business Class seatmap (these planes currently have no seats 1C and 1E). JFK-SVO has occasionally gotten one of these 767s during this summer.
FYI, JFK-SVO is supposed to go 767-400ER this winter, which means there will be flat-beds in Business, and AVOD PTVs in Economy.