Visa exemption rule - 144 hours in Shanghai without visa?

I'm traveling to SH and would like to use the 144 hour exemption. I have a US Passport and am traveling from USA to China. Can you please tell me if this itinerary qualifies?
11/14: depart Salt Lake City, layover in LAX, LAX to SH landing on 11/15.
11/20: depart SH and land in Seoul.
11/22: depart Seoul, layover in LAX, LAX to Salt Lake City.