Some very intresting UFO reading here. Here is video of the 1997 Phoenix, AZ UFO(s):
Jeff wrote with some interesting pictures. Check out his web site (with video): www.petroglyphsinthesky.com. My view is that the videos could be of silver balloons, but who knows.
The photo below does not seem to be of balloons. Click “postcards” to enlarge Jeff’s pics of the Phoenix UFO mothership! Could be a flying triangle?