CHICAGO (AP) -- Officials say two private planes veered dangerously close to each other this weekend because of an air controller miscommunication.
It was the second serious error in less than a week for a Federal Aviation Administration radar facility near Chicago.
The planes were traveling over central Wisconsin on Saturday when they came within 2.8 lateral miles and 500 vertical feet from each other.
Federal regulations require at least 1,000 feet of vertical separation and at least five miles of lateral separation.
The planes were about 3,800 feet off the ground near Lone Rock (Wis).
Last week, two commercial passengers planes came within seconds of a midair collision over Indiana.