For proper context, make sure to first read our original post linked here detailing the event, how our report came to be in the first place, as well as the rare confirmations as to its authenticity from both the FAA and the USAF. Below is also a short explainer video that will give you a basic overview of the incident.

Now, through the Freedom of Information Act, we present what could be one of the most insightful instances of official documentation surrounding such an encounter that had already been confirmed to have occurred by both the FAA and the USAF. These materials include fascinating audio recordings of radio transmissions and phone calls made as the incident was unfolding, as well as pilot interviews, and conversations between FAA officials made in the aftermath of the highly peculiar incident.

Last November, The War Zone posted an exclusive story detailing a bizarre incident involving an unidentified aircraft that transited the skies of the Pacific Northwest in the early evening of October 25th, 2017. What started as a radar target moving at very high speed over Northern California turned into a series of eyewitness accounts made by nearby airline pilots traveling northward over Oregon. Even F-15 fighters were launched to intercept the mysterious intruder that quickly became invisible to radar.

The first video includes audio from the initial spotting of the object as it ripped its way across Northern California at high speed, before it took a turn north and merged with nearby air traffic and disappeared from radar. Once again, beyond becoming invisible to radar, this aircraft had no transponder broadcasting nor did it ever communicate verbally with air traffic controllers. The audio in the video goes on to be sync'd in real-time with radar data obtained via our FOIA request.

Fast forward three months later, and now we have so much more evidence that adds incredible depth and color to our original report and the limited radio recordings we originally had to go off of. Via our Freedom of Information Act Request we received hours of audio, all with unique elements that add to this story. What we have done is packaged that audio, as well as the radar data provided, into four separate videos. We will highlight some of the big takeaways from each video in our piece, but we cannot stress enough how interesting and eye opening this audio is to listen to in full, so we highly recommend you do so by watching each video in its entirety.

This second video is just the radar data in its raw form. It starts before the sync'd recording begins above so we thought we would post it in full so our readers can take a closer look if they want.

The F-15s first appear on radar as they climb out of Portland to the south at time index 33:33 as "Rock" flight—a common callsign used for the alert F-15s stationed at PDX. Alaska 439 asks for an update on the unidentified aircraft and the controller notes they still have nothing on him, saying colloquially that it must be in a kind of "stealth mode or something." It's also interesting that the F-15s first went south when it seems as if the object would have been north of PDX by the time they finally launched.

At roughly 27:30 into the video we get our first indication that the F-15s out of PDX are about to scramble, with the air traffic controller noting this while talking to another FAA controller, during which the controller also reiterates that there has still been no radar contact with the aircraft. The controller also repeatedly asks aircrews nearby to check their Traffic Collision Avoidance Systems (TCAS) for the aircraft, which all come back negative.

The "intruder" quickly dropped off radar and that's when the visual sightings made by airline crews began. They continued for roughly half an hour and over hundreds of miles. The exchanges between nearby pilots and air traffic control regarding the unidentified aircraft were constant in the audio, with the same description coming back time and again—that of a white aircraft cruising at around 37,000 feet that is too far away to tell the type or if it has markings of any kind on it.

In the audio the Oakland Center controller notes that it is near his boundary, so it seems the aircraft's first appearance officially occurred near the border of Oakland Center Sector 31 and Seattle Center Sector 13 or 14. The target was moving "very fast at 37,000" feet when it was first detected.

Oakland Center Sector 31 first detected the target around 4:30pm PST. Below is a chart showing where Oakland Center's high altitude sectors are situated around Northern California. Sector 31 spans roughly from Sacramento up towards Redding, before its northern edge, which is near the border with Oregon, terminates and Seattle Center's airspace begins. To the east, the airspace sits along the California-Nevada border. This makes sense as the craft was eventually tracked by airline pilots as it made its way up over Crater Lake and towards the Willamette Valley.

Next we move into some very interesting recordings of FAA phone calls that occurred as all of this was taking place. We edited out dead space in the audio between phone calls and bleeped the names of those who named themselves. Aside from that, the audio is unedited by us, although we cannot be certain if parts were redacted by the FAA or not. There were a few strange areas where conversations went mute and it's not clear if this was edited or just an anomaly. The primary person talking in most of these calls is the Operations Manager In Charge for Seattle Center at the time that the incident took place.

Finally, we get to our last and most interesting of our evidence videos. It contains the calls made after the incident occurred. Seattle Center's Manager In Charge of Operations tries to figure out what happened exactly. In doing so he talks once again with Seattle Center and the trio of airline pilots that spotted the craft visually and has some very interesting conversations with the FAA's Air Traffic Organization Security office and the agency's Safety and Quality Assurance Group.

In the final set of calls in the video we hear controllers talking about how the Air Force wants to set up an air patrol over Battle Ground, Washington, which is a dozen miles directly north of PDX. We know the F-15s headed south initially, so it isn't clear if this call came after they initially headed in that direction or before they were even airborne and the plan changed later on for some reason. Once again "Rock" refers to the callsign of the alert fighters.

When the Manager In Charge is asked if he was asking for military assistance by another FAA controller, the tape goes blank. The same inquiry is heard moments later, and it goes silent again before another call begins. Although it really doesn't have much impact on the greater mystery, who asked for the F-15s to scramble and when, comes up in the next video in an exchange between the same manager and an FAA official.

You will notice that the term "DEN" is referred to repeatedly in these recordings. That is the Domestic Events Network, a sort of hotline system that is used to bridge the FAA with federal authorities, namely the military, during a number of circumstances which you can read about here . You will also hear the term "WADS" and the nickname/callsign "Bigfoot." This refers to the Western Air Defense sector of NORAD that monitors the airspace over a huge swath of territory in the United States and Canada. Based out of McChord AFB in Washington, WADS scrambles the fighters when needed and works to direct them to their targets of interest during domestic air sovereignty missions, among other responsibilities.

The first call is to Oakland Center, and it occurs early on after the initial radar detection and as pilots began spotting the craft visually. He also mentions that "air defense" is looking for the target now too (on radar), so it shows how early the military was involved in the encounter.

First we hear about the big question as to who "requested" the scramble, as according to the call, it has to come from FAA headquarters. The manager floats the idea, in retrospect, of having the airliners keep a visual on the craft instead of allowing them to descending into PDX, at least until the F-15s show up, but the FAA official swats that down as they didn't know what the aircraft was, "if they are equipped with anything" or its intentions. She reiterates that getting the military involved was a good idea but that it should have come from FAA headquarters over the DEN. The manager reminds her again that he doesn't know who requested military assistance and that Oakland Center told him to call WADS initially. Next we hear from Oakland Center again, at first discussing who ordered the scramble, but then the conversation goes into talking about what actually happened. Both agree that there was "definitely something out there" with the Oakland Center controller saying the aircraft first appeared going southbound at high speed before executing an abrupt maneuver and then "took off northbound." Even figuring out how to report the encounter seems totally foreign to both higher ranking controllers, with one stating "I have a feeling someone is going to go through this with a fine-tooth comb."

Tyler Rogoway/Author An F-15C from the 142nd Fighter Wing blasts out of PDX just after sunset.

Then we get into the pilot interviews over the phone, with the manager's intention being for each crew to write up a report detailing their individual perspective of the incident. During the call with United 612 there are some odd dropped moments, but the pilot describes the encounter, stating that he was too far away to make out the type. The next call, with Alaska Airlines 525, also doesn't reveal much as the crew says they never were able to see it, but the crew of Skywest 3478 did, although he didn't have much to add. The call with the pilot of Southwest 4712 was by far the most interesting. He immediately notes how strange the encounter was and how he has never seen an incident like it in nearly 30 years of flying jets. The pilot noted, "if it was like a Lear (private jet) type airframe I probably would not have seen it this clear. This was a white airplane and it was big. And it was moving at a clip too, because we were keeping pace with it, it was probably moving faster than we were... It was a larger aircraft yeah." He also said they watched the object from Northern California all the way to their descent into Portland.

Tyler Rogoway/Author A 737 about to land on runway 28L at Portland International.

The manager's final call, was with the FAA's Quality Assurance Group, who is taken by surprise by the details surrounding the event, and especially with the fact that nobody still knew what the aircraft was or where it ended up. "Wow that's weird" is the operative quote by the FAA official, which is insightful to say the least as these people deal with unique incidents that occur in American airspace on a daily basis. The manager agreed with the sentiment and noted that it wasn't some small aircraft and it was moving fast, outpacing a 737 cruising nearby. The official also says that the incident should be classified as "potentially significant" on reporting documents. She even said that this was "a weird enough thing that there is not a set procedure... It's not often we hear about an unknown guy up at that altitude." Collectively these materials give us incredible insight not only into this incident, but also into how such an event is actually handled in real-time by those who are responsible for the safety of those in the air and those on ground below. What they don't offer is any sort of an explanation for what happened on that fall evening. But really, the fact that all those involved, from air traffic controllers, to Air Force radar operators, to airline pilots, and even special FAA officials tasked with responding to all types of out of the ordinary incidents that occur in the sky on a daily basis seem just as puzzled with this event as we are makes the story all that much more intriguing. Above all else, this new evidence underscores just how rare these events actually are, especially ones that include multiple sightings, the use of multiple sensors, the involvement of various agencies including the military, and some of the most capable air-to-air fighters in the world. And after recent reports unmasking how the Pentagon remains highly interested in encounters just like this one, it holds even more weight than it did three months ago. We will continue to investigate this bizarre incident and we will keep you updated as to what else we discover. Contact the author: Tyler@thedrive.com