shape shifting fast craft zigzagging in skies over Everett, WA leaving vapor trails.

I was driving at 9500 19th Ave SE, Everett, WA 98208 tonight and I noticed something flying straight up leaving a vapor trail looking south down 19th Ave SE.  It was zigzagging back and forth and that is what caught my attention.  I had a camera with me that had a high power zoom on it and I took several photos where I could see no visible object at the beginning of the vapor trail, but this thing was moving fast and was now headed north overhead. 
I pulled over and took several photos and it almost seemed to change shapes in flight.  It seemed to have a double vapor trail coming off of it and it continued to curve sharply one direction and then the other.  In some of the photos it looked like one giant group of rocks and then in others, you can see a ghostly transparent image of what looks to be a large airliner, but why would it be zigzagging sharply at speeds fast enough for a double vapor trail?  It seemed to have no less than 4 different shapes in 4 pho! tos taken just moments apart.  Then it was gone.  I looked back to the south where it had come from and the original vapor trail was fading away as they do, but I took one last photo of it to show the zigzag motion it had.  When I got home and looked at the photo on the computer, I see the craft was back in the southern sky just starting to leave a new vapor trail in the top of the last photo I took.  I didn't see that one until I noticed it later in the photo.  If it was the same craft, it would have had to do a 180 degree turn and move very fast to get back to that part of the sky by the time I took that last photo.