> What if the flight they allegedly used for the radar shadow would have been delayed or they would have been delayed? A ground contact could easily watch for

> What if the flight they allegedly used for the radar shadow would have been delayed or they would have been delayed? A ground contact could easily watch for the shadow plane's takeoff and indicate via radio that the operation was a go. It's quite possible that they had multiple windows of opportunity if all they wanted was the plane. Of course if it had to be that particular flight due to passengers or cargo it would be a different story.