Picked up on this actually. Was comparing notes with a mate who tracks these things using FlightAware and ADS-B Exchange - there were some genuinely odd gaps in the transponder data around that area during the same window. Not unprecedented near restricted military zones obviously, but the duration was unusual.
What caught my attention was the shape of the restricted corridor. Didn't follow the standard R-4808 boundary lines you'd normally expect around the Nevada Test and Training Range. Something was pushed further west than usual, closer to the Humboldt sink region.
Few possibilities worth considering:
Conventional explanation - hypersonic test vehicle, possibly X-plane programme related, Less conventional - the Skinwalker crowd would have a field day with the Humboldt area's history, Worth noting - FAA NOTAMs for that period have since been scrubbed from the public archive, which doesn't happen often with routine restrictions
I've been cross-referencing with some amateur radio operators on WebSDR who were monitoring UHF frequencies out that way. A couple reported burst transmissions on unusual intervals. Might be nothing, might not.
Anyone got actual NOTAM numbers before they disappeared? If we can establish the exact coordinates and timeframe properly, it's worth logging formally. These things are far easier to dismiss when the paperwork vanishes.
What date range are we talking specifically? Want to check my own records.