Sighting recorded Friday November 10th, 8:20AM. I witnessed an object off the lower left side of the plane (South/West). It would be best described as silver, cylindrical, shaped like a cigar tube. No Windows, Wings, Identifyable Marks or Propulsion source. It was half way between our plane and the ground. Taking into account the speed our plane was travelling, the object was either hovering or moving very slow in a South West direction along a parallel flight path with the ground. No erratic movement noted. I was on a Continental Airline flight. The plane departed at 7AM from West Palm Beach, FL, en route to Newark, NJ. We landed in Newark at about 9:30 AM. I have never witnessed an unusual object such as this before. The sighting lasted approximately 30 seconds. There was not time enough to get the attention of anyone else on the plane. The object appeared to be slightly less than half distance between our plane and the ground. I understand commercial aircraft generally travel at 35,000 feet, if this is the case, it would be my estimate that the object was located at about 17,000 feet. Visability was perfectly clear. There were no clouds anywhere. I cannot provide a comparison of the object to the sun, since my line of view was from above the object looking downward. I struggle to comprehend the actual size of the witnessed object. It was large enough that it was clear and distinct but otherwise small from my point of view. In comparison to objects on the ground, it was bigger than the size of a large house on the ground.((NUFORC Note: We spoke via telephone with this witness, and we found him to be quite lucid, and emphatic, as to the very real nature of his sighting. PD))