The following images were kindly provided by Howard Mason.The Northrop A-9A was a large ground-attack aircraft which was designed in competition with the A-10. Although it was not chosen for production, it was a formidable aircraft in its own right. Like the A-10, it carried many "hard points" for weaponry beneath its wings. Here, one of the two A-9As built is seen in the skies over Edwards Air Force Base during the fly-off competition. One A-9A is currently in the March Field Museum at March Air Force Base. The other is on display at the Castle Air Museum in California. (Air Force Flight Test Center)