This video of three unknown lights in triangle formation was filmed over Plano in Texas on 16th February 2013.
Witness report: I was outside on the patio with friends just enjoying the evening…when I saw those 3 yellow lights in a perfect triangle shape emerging in the distance from behind the silhouette of the roof.
Lights were not blinking, and no sound was heard. Speed felt fairly slow… the triangle shape remain steady throughout the observation until I lost visibility behind a tree and house.
It was striking weird to all people around me who witness this (about 6 person)
First thing that came to mind was 3 planes in formation, but the color of the light and the fact that no sound could be heard was rather strange.