Boeing's N7201S

Boeing's testbed 737-7, N7201S (c/n 42561, l/n 6744), is making a stop at JRF from BFI as BOE701. It's flying from BFI to PVG, via JRF and GUM. Bloomberg reports that this MAX7 will be heading to China to assist with re-certifying the the MAX series after the global grounding. Boeing sent pilots and engineers ahead to assist. 

Oddly enough, a few airlines in China have 737-8s already delivered.  There are dozens of China-bound MAX series in pre-delivery storage on the mainland.

N7201S will eventually be delivered to Southwest Airlines, after its testbed days are done.