This sighting took place at 4:30 pm on November 7, a Tuesday, during rush hour.

Does anyone have any idea how much street traffic surrounds O'Hare during rush hour?

The airport covers a large area. I suppose it's possible that nobody caught in rush hour gridlock saw this happen. But I know that whenever I've been stopped in traffic around the perimeter of the airport, there isn't a whole to do but look at the airport.

I'm just amazed that a witness hasn't come forward from outside O'Hare.