Flash of Light with Grey Disk

A grey disk. It was a Saturday afternoon. I was chopping wood. I heard an airplane. I spotted the airplane and it was heading south with respect to where I was chopping wood. The airplane flew out of view behind the roof. I was about to look way when the corner of my eyes I saw a flash of light behind the airplane. The flash of light was like from the Back To The Future film special effect. A grey disk flew or appeared out of it. It was disk shaped or ovalish and light grey to almost cloudy in color. The grey disk also flew out of view behind the roof and moved in the direction of the single engine plane. My theory. The airplane was an illusion/masked/screened by one group of unknown beings. These particular beings have the technology for masking their craft. The second unknown beings were in the grey disk.