An infrared camera facing upwards captured a mantaray looking object

An infrared camera facing upwards captured an object resembling a mantaray. It was only visible for about a quarter of a second during about seven seconds of "madness" when a wind came up suddenly. Consequently, someone at work who has a pilot's license thought it might be a plastic bag, but that seems unlikely to me. Apart from a mantaray, it makes you think of Lockheed’s F-117 Nighthawk or Northrop’s B2 Spirit. It is similar to the illustration of an object seen at Farnham Quebec, on 21 July 2017. That object was seen only from the front before it quickly departed, and was said to have windows. It was not portrayed from the side. The following screen capture is its tail, which was not portrayed in the Farnham case because probably not visible. I'm sorry if this is the second submission of the same thing. I'm sure I sent this one along before, but I don't see my record of having done so.