Apparently accompanied by one of Boeing's T-33s for the final portion of it's flight, which looks like the obligatory photo run around Mt Rainier: https://flightaware.com/live/flight/N109X/history/20200125/1700Z/KMWH/KBFI
The source article in the Seattle Times:
https://www.seattletimes.com/business/boeing-aerospace/boeing-777xs-fuselage-split-dramatically-during-september-stress-test/
"the aircraft has proved a hit with airlines, and a useful source of profits for the company"
Given the problems with development costs and rollout delays on the 787 program, I question if it is a source yet of profits for Boeing.