Mystery Plane Spotted Flying in Sky at Area 51 [video]

Key footage starts at 9m50s: https://www.youtube.com/watch?v=V1xujbcCVvU&t=9m50s

> After a couple hours of not seeing much more than contrails in the distance, closer to 3:00 in the morning, I got another low flyover, but this one looked different.

> The aircraft that passed overhead this time appeared to be closer to an equilateral triangle shape with a flatter trailing edge.