Last time I checked no air force had a craft that could pull such maneuvers But who says it was a craft? Why not a lightening phenomena of some kind that could be tracked by radar? That could be anything, really.
Because the radar contacts in question were indicative of large metallic objects, not the result of natural phenomena and in many cases, the objects were visually confirmed as artificial flying machines and in some of those cases the objects reacted to radar lock-ons, which suggest they were intelligently controlled.
The durations also exclude ball lightning and other weather- related phenomena as well. Meteorologist and scientific studies have shown that natural phenomena was not responsible for the UFOs in questions and pilots and ATC ground controllers who were involved in those incidents have concurred with the conclusions. Experienced radar controllers can easily differentiate between radar 'ghost angels' caused by temperature inversions (soft targets) and contacts of objects such as aircraft (hard targets). For an example, you are holding a rock (hard target) in your left hand and a sponge (soft target) in your right and with your eyes closed you can easily differentiate between the two and that is why the UFOs in question could not have resulted from weather-related phenomena.
Edited by skyeagle409, 30 October 2006 - 12:46 AM.