> Incidentally, hobbyists have been flying triangular jet-powered high speed drones since at least 2017.

There's advanced hobbyists who have much more sophisticated drones as well [1]. Nothing outside the reach of more advanced advanced engineering with fuel cells. Though it could be some covert government program or research group and possibly even foreign governments.

The drone in Tuscon AZ outran police helicopters for over an hour:

> Typical commercial drones cannot travel 100 mph even under the best conditions. > Eventually, the helicopter ended up flying toward Mount Lemmon at an altitude of 14,000 feet, thousands of feet above the helicopter. The pilot wrote the drone would circle the helicopter at 100 mph. > "[T]his did not appear to be any off-the-shelf" drone, the pilot wrote. > Another helicopter crew member wrote it appeared to be a "very sophisticated/specialized" drone that was "able to perform like no other...I have observed."

1: https://www.12news.com/article/news/local/valley/tucson-poli...