Not sure where I should post this but I'm going to be on a Delta flight from DTW to PVG and connecting on SkyTeam partner China Southern to CAN (two separate tickets in economy). Procedure in PVG when transferring is that you have to clear immigration and re-check in your bags. I've done this route twice in the past and haven't had any problems checking in the two bags with China Southern (thought I might due to check-in restrictions on domestic flight is 20kg). China Southern airline staff told me that if you are connecting from a US flight your bags are not subject to that restriction. I wasn't quite sure whether that's true but for my upcoming trip I am going to be checking in 5 bags so will definatley be paying excess baggage charges to Delta so my question is will China Southern charge me again? Again in the past I haven't had trouble checking in two bags but I am not sure I can get away with 5.....