Hi, from what I read ZED travelers are permitted one free checked bag within the size/weight limitations of the transporting airline. You will have to recheck it it means going through Korean custom and immigration. As far as the health requirements due to covid you might need to check with some official pages https://www.airport.kr/ap_cnt/en/svc...cal/medical.do It seems that now we need a visa https://www.koreaonlinevisa.com/visa...nts/americans/ You might also want to read that https://www.koreaonlinevisa.com/travel-restrictions/ it talk about transit. As a rule of thumb because we travel on standby it is assumed we are going to stop in the connecting country. One thing clear to me is the bag rules. You might want to look in detail at the rules and regulations about Korea. Enjoy your trip