This video discusses the Aurora scramjet, a legendary secret aircraft supposedly developed between 1970 and 1990. I noticed an interesting comment on the video from none other than Whitley Strieber. Here is what he said:
"Aurora was listed in the USAF budget back in the 1970s before the budgets went black. When it was in test out of Edwards in the early ’90s, locals were complaining to their representatives to the point that the Senate Select Committee on Intelligence discussed_ it. I also know a fisherman who saw what was almost certainly an Aurora over the Gulf of Mexico in those days. Is it deployed? I hope so. We spent a great deal of money on it. A great deal."
The first contrail shown in the video is a natural cloud formation called a ‘Morning Glory,’ but the next contrail, and the one captured on Google, are almost certainly scramjet contrails.