The 737 flight tests involve a departure from Renton and arrival at Boeing Field from which all further flying takes place. However, on some flights, approaches are made to Paine Field. One COPA 737 Max made such an approach while I was there. I was at the departure end of the field and, while sometimes they will land and back taxi before taking off again, this time it was a go around. Consequently, they were quite high by the time they passed me. Still worthy of a few shots, though.