Transiting throught Guangzhou and Chengdu Airports

I am considering a one-way flight from Manila to Los Angeles with two stop overs at Guangzhou (CAN) and Chengdu (CTU). Each of these stop overs are less than 5 hours duration.

The first flight will be from Manila to Guangzhou. At Guangzhou I will transfer airlines from China Southern Airlines to Hainan Airlines. At Guangzhou airport I will be required to pick up my luggage and check in at the Hainan Airlines counter. Thus, I'm assuming that I will have to pass through customs in order to pick up my luggage and then check in at Hainan Airlines counter.

From Guangzhou I will then fly to Chengdu to catch a connecting flight to Los Angeles. Both flights will be with Hainan Airlines.

Do I still need to obtain a visa?

Any insight would help.

Thank you in advance.