Abstract: An overhead door for use in selectively blocking large openings such as aircraft hangar doors, warehouse doors, etc. The door includes a primary or main door member pivotally mounted to the door opening and one or more secondary door members pivotally mounted within the main door member. A tracking mechanism causes the secondary door members to move to a substantially horizontal opened position when the main door member initially begins movement toward a substantially horizontal opened position and to maintain this horizontal position throughout the opening cycle of main door thus providing minimum wind resistance as the door is opened.