(EN) Schamel, John, How the Pilot's Checklist Came About, su FAA Flight Service Training. URL consultato il 12 gennaio 2007 (archiviato il 13 maggio 2007).
«On board the plane were pilots Major Ployer P. Hill (his first time flying the 299) and Lieutenant Donald Putt (the primary Army pilot for the previous evaluation flights), Leslie Tower, Boeing mechanic C.W. Benton, and Pratt and Whitney representative Henry Igo. Putt, Benton and Igo escaped with burns, and Hill and Tower were pulled from the wreckage alive, but later died from their wounds.»
