Didn't see it myself but my brother-in-law lives near Scottsdale and was out walking his dog around 10pm that night. He texted me about something triangular with three steady white lights and one red one underneath, no sound whatsoever. He said it moved way too slowly for a conventional aircraft then just sort of accelerated and vanished.
What I'm trying to figure out is the altitude. Did anyone watching get a rough sense of how high it was? My brother-in-law estimated maybe 2,000-3,000 feet based on how it compared to a small plane he saw earlier that same evening, but he admits thats a guess. The silent low-speed movement before rapid acceleration is the part that really stands out to me, thats not consistent with any conventional platform I know of. TR-3B speculation aside, has anyone cross-referenced this with flight radar data for that window? Would really help narrow down whether we're looking at something genuinely anomalous or just an unusual military test flight out of Luke AFB.