Here's an interesting Flying Saucer sighting at Chicago O'hare written by a credible journalist in the Chicago Trib. It's pretty interesting.
United Airlines forced several pilots and mechanics not to repeat what they saw. The journalist who did the story is trying to get the actual transcripts via the freedom of info act. The pilots only spoke to the journalist under promise of anonymity. The object was seen by about 20 credible people in broad daylight over Ohare. The pilots stated it was real, made of what looked like metal, and flew so fast straight up that it punched a hole through thick clouds they could see blue sky through. The original story (with video):
Here's another UFO sighting. This time in Texas on Jan 8 2008. The special thing about this sighting was that the craft was sighted by "many towns people," including a pilot and a policeman. Unfortunately, there are no pictures or videos as of yet, although there is a reward for some. The craft was said to be very large, silent, and hovering. Here's the story from NPR.