Hi thorbiorn,
Thanks for sharing, but I'm afraid you have been misled.
On the YouTube page of this vid (upload May 7, 2014): _http://www.youtube.com/watch?v=EJfKk1tejek comments abound that this is a fake.
It's always useful to go to the original source and read the comments over there before posting anything here, I have found.
This seems to be the original footing of the attack first uploaded in 2007, October 5: _https://www.youtube.com/watch?v=8oTjTufJnXI
In the comments of that one on YouTube we read:
A fake version of this is on the Daily Mail website today. They mirrored it and added a quote "UFO" :D
The same vid you posted can also be found here (upload May 6, 2014) as a March 14, 2014 event: _http://www.youtube.com/watch?v=jPnRxzYrFEU
Comment:
Thanks to Tomteeejay.
Video has proven to be fake.
Click for the original video: _https://www.youtube.com/watch?v=8oTjTufJnXI
which is the one I already referenced.
Other interesting sources:
_http://www.dailymail.co.uk/sciencetech/article-2185304/NASA-Boeing-successfully-test-triangle-airplane.html
_http://beforeitsnews.com/beyond-science/2013/11/black-triangle-ufos-tr-3b-aurora-and-astra-2444344.html
_http://www.uforth.com/triangular.htm
_http://www.ufoevidence.org/topics/triangles.htm
http://www.sott.net/article/200424-Triangle-shaped-UFO-Delta-Flight-106-over-North-Atlantic-Ocean
Hope this helps a bit. ;)