I'm arriving in Beijing from the USA with a connecting flight to Korea. I have a 90min layover.

Do I have to claim my bag, go through customs, re-check the bag, go through security all before my reconnecting flight? My flight into Beijing is T3 and my flight leaving is a different airline but is also T3.

I"m worried I will miss my reconnecting flight.

Any thoughts/help mush appreciated.

Thanks!