19th November 2010. During the time of this filming, an Airforce Exercise was allegedly being carried out. According to the OP, there appears to be a triangular craft midway through the video. Is this part of the exercise and therefor could it be the (semi) Top Secret TR-3B Aurora/Astra, just regular aircraft or something else? 

Personally I couldn't detect the triangular nature of the craft whilst viewing the video, therefor I captured a series of screenshots after the alleged triangular craft showed up. The above image was captured from the video, blown up to 300% on the screen and then another 200% on photoshop. A triangular shape can just about be made from the image and I have drawn some crude lines on the second image to determine the possible shape of the craft. The image is from 04:57 on the video timeline.