Both American aviators Noel Guy Davis and Stanton Hall Wooster were preparing the aircraft for a transatlantic flight from New York to Paris, taking part to the Orteig Prize. Named 'American Legion', aircraft was the first prototype of the Keystone K-47 Pathfinder and built especially for this crew and mission. From the airbase of Langley, Virginia, crew was performing a training flight around the base. Shortly after takeoff, while climbing to a height of fifty feet, crew noted the presence of trees and made a sharp turn to the left. With an insufficient speed, aircraft stalled and crashed in a swampy area and was destroyed. Both occupants were killed.