UFO description from my seat on an airplane

So friday night i was flying from jersey to vegas, and with no movie, i decided to watch outside my window for 3+hrs of the 5. So after seeing some nice contrails and chemtrails, and lightning storms, i saw an object i could not recognize. now i wasnt above vegas, i was before the rocky mountains at around 940 EST. We were flying westbound and 36,000ft crusing altitude. from the corner of my window, i saw a black object fly across and away from our plane, above us, i would say 38,000ft on a southeast course. now the odd description: the vehicle was all black, and not the disk, flat image people often recall, this was very rigid and appeared like it wouldnt be very aerodynamically stable. it had a thin body with flat wings that went up at around a 70 degree angle (see illust.). It flew with a rapid speed, and had what appeared to be an exhaust trail, except it didnt trail. It looked more like how a tail on a kite would look. it didnt vary in length or position, it appeared fixed, although it was a cloudy semitransparent color. after it went towards the center of my window quite a distance away, it appeared to change directions multiple times very quick, almost like it stopped acceperating and decided to rotate, which allowed me to see it had a U-like shape, it then slowly faded out, i cant tell if it "dissapeared" or flew off, because i was fiddling with my phone trying to zoom and get an image, but it was too far away. I did do a mini sketch right after seeing it, and then i redid it poorly in paint to get the gist. It looked like this:


is this an existing craft? possibly secret? or is it unidentified?

[edit on 5/13/0707 by I Am The Influence]

looks like the "tail fins" of a fighter jet to me.

anyone else?

i thought that too, but then i asked, well wheres the rest of the plane? plus at the distance it was at, tailfins on a jet wouldnt have been noticable. id say it was a good mile or so away. its hard to gauge distance when in the air.

maybe you saw this thing?

that was my first assumption, but it doesnt seem likely to be a stealth bomber, because the wings were upright. and it probably wasnt the tail end, because the length of the wings were longer than the width of the body.