Who could keep such a secret? The person exposing this would be known thru-out all future history. Too much temptation.
There is quite a lot of information being withheld.
The US Navy has released video and its pilots have talked publically about their experiences.
There are also reports circulating of US military aircraft encountering ufos on a daily basis in some areas.
For 6 years, Mr. Callahan was the Division Chief of the Accidents and Investigations Branch of the FAA in Washington, DC. In his testimony he tells about a 1986 Japanese Airlines 747 flight that was followed by a UFO for 31 minutes over the Alaskan skies. Mr. Callahan was able to secure video tape and audio evidence of the event.
Something is going on out there that is not being explained
There are very few official sightings publically reported of massive mothership UFOs

Japan Air Lines Cargo Flight 1628 incident - Wikipedia

The info in the wiki pages of JAL 1628 and the witness testamony video is extensive. The mothership was reported as 2x the size of an aircraft carrier with 2 other UFOs involved.
[Anchorage found nothing on their radar, but Elmendorf's NORAD Regional Operations Control Center (ROCC), directly in his flight path, reported a "surge primary return" after some minutes.]
This sighting for 30+ minutes involved 3 UFOs is recorded by the FAA - there is extensive witness testimony from a very Senior FAA director, pilots voice recording and radar transcripts etc meetings with military and CIA etc and the cover up by the authorities is also detailed in the video link above with the senior FAA officer.
The Nimitz tic tac video and other official US Navy videos showed some hidden UFOs (FLIR infrared)
Documents | NAVAIR - FOIA
The first link above is a FLIR recording from 2004 ? There are more FLIR videos in the link above
The US Navy FLIR videos have been enhanced with text - as below from sightings in 2015 ?
View:
In the Nimitz encounters there are reports of a craft the size of a submarmine going into the sea from the air the craft appears to be using some sort of cloaking device - see the video from 1min 30seconds on
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