On September 23, 2012 in Langhorne, PA, I saw four unidentified flying objects and unusual aircraft activity.On September 23, 2012 at 6:55 PM ET, I saw three unidentified flying objects in the sky. It was dusk. I was traveling west bound on Route 1 in Langhorne, PA (Bucks County) and the objects were in the western sky traveling south. The objects were approximately 10-15 miles away. There were three separate objects in a formation. One of the objects was 60 degrees above the horizon, the second object was 80 degrees above the horizon and the third object was 100 degrees above the horizon. Each object appeared as a bright white line with a bubble or half orb shape on the top followed by a pinkish orange flame. The flame remained constant in shape and size on each object. The objects were descending, all at the same trajectory, and seemed to be moving at a slow and steady pace. I know what a comet looks like moving through the sky and these were not comets. Also, there was an unusual high activity of aircraft in the sky. There were approximately a dozen planes i! n the sky flying toward the objects. The aircraft were faster and smaller than passenger jets and I assume that they were military or fighter jets. One of the aircraft circled around and flew low over the highway and I could see that it was a fighter jet, probably an F-18.I continued traveling on my intended route and got on the PA turnpike (Rt 276) heading West and once on the PA turnpike, I identified a fourth object, similar in all regards to the other three but flying to the North and much higher than the others. I would lose sight of the objects among the tree line on the highway and once I got to the Jenkintown exit on the PA turnpike, I lost visibility of all objects and aircraft activity.