Originally Posted by
Water pilot
I do think local media would have noticed that many fights around Renton. I'm pretty sure I saw one flight test and it was quite distinctive, no way of mistaking it for a regular flight. (It is quite impressive to see a commercial airliner pretending that it is a YAK-3 at an airshow, must have been fun for the pilots!)
The test flights are out of KBFI or KPAE. They either head out over the Pacific about 50 miles off the coast or else to an area just west of Moses Lake. They use the call sign Boeing 1, and on flightaware.com as BOE1.