Discovery Channel - Original Air Date: 1997?
I just caught a few minutes of this recently, though I've seen the full show in the past. The part I saw that's worth noting is the show's dramatic and convincing explanation for the 10pm (I believe) set of Phoenix Lights: they were flares. UFOlogists reject this idea out of hand, but the show has a demonstration that the "winking out" of the lights coincides with them disappearing behind a mountain range. This is accomplished by aligning the original "UFO" footage with daytime footage taken in the same spot. You can literally see the lights going behind the mountain--which means they weren't over the city, but were on the other side of the range, where the military was conducting exercises (and dropping flares). I don't remember whether the show had an explanation for the earlier sightings of V-shaped craft (probably not), but the footage you always see of this incident -- on Larry King, for instance -- is definitely flares. UFOlogists don't do themselves any favors when they ignore conclusive proof like this; it makes them look like kooks. It also wastes time and resources that could be spent on investigating actual, unexplained incidents.