Originally Posted by Often1

Yes, there is a current interline baggage agreement between SK and AY. Here is a list of all current agreements. Source: IATA via ExpertFlyer. Although the question was not asked, just in case it is behind OP's question, the presence of an interline baggage agreement would not assure that SK would check across separate tickets.

MAY CHECK BAGGAGE TO
AA AC AF AI AS AT AV AY AZ A3 BA BM BR BT
BU B2 CA CI CM CX DE DL DT DX EI EK EN ET
EY FI FM FV GF GL HA HM HX IB IG JJ JL JU
KA KE KL KM KQ KX LA LG LH LO LP LR LX LY
ME MH MI MK MS MT MU NH NZ OA OK OS OU OZ
O6 PG PR PS PZ QF QR RO SA SB SK SN SQ SU
SV SW S4 S7 TA TG TK TN TP TU T0 UA UH UL
UX VN VS VX WF WY XL ZH 2K 4M 9W