Bit late to this thread but I'm curious - did anyone manage to get footage? I'm in Norfolk so obviously wasn't there myself but I've been following the Phoenix area sightings for a few years now and triangular formations keep coming up again and again. The 1997 lights were never properly explained and it feels like whatever is happening there never really went away.
What altitude were they at roughly? And were they silent or was there any low hum? That detail matters a lot I think because a few witnesses from older sightings mentioned a kind of subsonic vibration more than an actual sound. Also how long did the formation hold its shape before it broke apart or disappeared? Was it gradual or did they just blink out?