Mike, I posted some similar photos here in the photo section....had a two-ship zooming by me one day and captured it as well.
I later found out I was near a military exerecise, so it stood to reason that aircraft - manned or not - were zipping by at "warp speed."
For me, I was near the P-40 (prohibited area) near DC, usually the POTUS area (rarely used).
It is strange seeing the little triagles ZOOM across the screen as everything else seems to crawl...
Mike N714AJ