by L.W. Pogue, E. Warner, H. Branch, and O. Ryan for the Civil Aeronautics Board, Aviation Accident Report: 1942 TWA DC-3 and Army C-53 mid-air collision (1943)
“ In this instance, Air Traffic Control cleared the TWA DC3 to climb through the overcast, within the limits of the airway along which they knew the Army C-53 was flying, and before the Army flight had reported in over the Kansas City Range Station. Issuance of this clearance authorized the TWA aircraft to pass through the flight altitude and the probable path of of the Army aircraft. Until the Army plane had reported as over its fix at Kansas City, Air Traffic Control had no positive assurance that the TWA flight path would not intersect the Army flight path. ”
