I was sitting on my porch, noticed a light that looked like it was behind a cloud or food, but the night is completely clear here, at first i thought it was a plane, but then a plane flew by it undistorted. it moved slowly,and looked like it turned a bit before it let out either a cone shaped self reflecting vapor type trail, could have been two separate tails that were just at the right angle to make it look cone-shaped. i was flabbergasted and in disbelief for a while, even after it disappeared below the surrounding buildings. my camera wouldn't adjust to the low light enough to capture anything.