PJSC Siberia Airlines (S7 Airlines) informs about access from January 11, 2017 to issuing on EMD-A of additional service on advance payment of excess baggage.
Please pay attention to check-in procedure: all baggage for flights are issued under the subcode C / 0AA.
Requirements of Siberia Airlines to booking and pre-payment of excess baggage for S7 flights in TCH session and examples of baggage issuing are under the link (in Russian).