LAX - SYD - PVG - PEK - TYO - LAX

Hello - I'm confused so you're help is most appreciated. The transit between PVG - PEK - TYO - is via ship. The LAX - SYD - PVG and then TKO to LAX is via air. There are 3 days in Shanghai, 3 days in Beijing. We may possibly be in Shanghai for 4 days. Am I eligible for the 144 hour visa? Thank-you.