Yep, that looked just like the condensation I see every time I drive my truck...LOL.. NOT!!!
Not sure what it was, but would love to see a frame by frame look at it, and would have loved to have seen it myself. One thought though, could it have been the hypersonic jet or the secret space plane the military has been flying?? Just asking is all. Though I've had it suggested that I ask too many questions... LOL. Dang my wife!! Love her truly, even though.