It was a wet and gloomy weekend morning up in Everett and so might not have been worth heading out.  However, National Airlines was bringing a 747-400 into the Boeing facility and that was worth a trip. The plane emerged from the gloom as it came down the approach and, as it came across the threshold, the vortices could be seen streaming off the flaps. A grey jet on a gloomy day is always a tough one but I think this was definitely a result.