I will be flying to Bangkok via Beijing Capital airport. I do need a visa for Bangkok, but I wonder if one is necessary for changing plane at Beijing airport. Also, is the luggage checked through automatically to Bangkok or do I have to pick it up and check it at Beijing? I am flying from Wrocław (WRO)to Frankfurt International(FRA)with EUROWINGS and then from Frankfurt International (FRA)to Bangkok Suvarnabhumi International Airport (BKK) via Beijing Capital airport with Air China