Weird rectangular light in Fort Wayne, Indiana

On August 16, 2017, in night, a witness saw a rectangular white light in Fort Wayne, Indiana. What is it?

Witness report:

I noticed a plane landing wile i was at a stop light and what i thought was another plane beyond it. the object was longer and wider than the small plane that was landing. it was a rectangular shape and was glowing bright white. it maintained a slow level path and i lost sight of it. five miles later i seen it again. the rectangle began to shrink rapidly and a gray spot formed in the middle and i watched as it disappeared right before my eyes.

Source, 14th April 2019