Daytime UFO

Fairly confident those are mylar balloons, three tied together, trailed by a fourth. The orientation of the three change from the triangle shape initially shown to more of a three in-line vertically (relative to the camera) as they get closer to the right side of the frame.

My first thought was this was a USAF tanker with a receiver aircraft in trail, but seeing the shape of the lead object change nixed that.
 
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