I haven't tracked this very closely, but most seem to be happening in restricted airspace.
I googled to see if my assumption was correct and landed on this from 60 Minutes 3 years ago
UFOs regularly spotted in restricted U.S. airspace, report on the phenomena due next month
We have tackled many strange stories on 60 Minutes, but perhaps none like this. It's the story of the U.S. government's grudging acknowledgment of unidentified aerial phenomena— UAP—more commonly known as UFOs. After decades of public denial the Pentagon now admits there's something out there, and the U.S. Senate wants to know what it is. The intelligence committee has ordered the director of national intelligence and the secretary of defense to deliver a report on the mysterious sightings by next month.
Bill Whitaker: So what you are telling me is that UFOs, unidentified flying objects, are real?
Lue Elizondo: Bill, I think we're beyond that already. The government has already stated for the record that they're real. I'm not telling you that. The United States government is telling you that.
Luis Elizondo spent 20 years running military intelligence operations worldwide: in Afghanistan, the Middle East and Guantanamo. He hadn't given UFOs a second thought until 2008. That's when he was asked to join something at the Pentagon called the Advanced Aerospace Threat Identification Program, or "AATIP."
-snip-
Lue Elizondo: Imagine a technology that can do 6-to-700 g-forces, that can fly at 13,000 miles an hour, that can evade radar and that can fly through air and water and possibly space. And oh, by the way, has no obvious signs of propulsion, no wings, no control surfaces and yet still can defy the natural effects of Earth's gravity. That's precisely what we're seeing.
Read the article. It gets better.
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