^The latitude and longitude information provided in this table was derived originally from the National Register Information System, which has been found to be fairly accurate for about 99% of listings. For about 1% of NRIS original coordinates, experience has shown that one or both coordinates are typos or otherwise extremely far off; some corrections may have been made. A more subtle problem causes many locations to be off by up to 150 yards, depending on location in the country: most NRIS coordinates were derived from tracing out latitude and longitudes off of USGS topographical quadrant maps created under the North American Datum of 1927, which differs from the current, highly accurate WGS84 GPS system used by most on-line maps. Chicago is about right, but NRIS longitudes in Washington are higher by about 4.5 seconds, and are lower by about 2.0 seconds in Maine. Latitudes differ by about 1.0 second in Florida. Some locations in this table may have been corrected to current GPS standards.
^This aircraft is listed as "Address Restricted" in the NRIS. It is shown to be on Attu by this nomination form for the Attu Battlefield and U.S. Army and Navy Airfields on Attu. The coordinates are those of the mouth of Temnac Valley as given by the .
^Fisher, S/Sgt. Jim, "A Fitting Tribute", Airman, Air Force News Agency, San Antonio, Texas, September 2000, Volume XLIV, Number 9, pages 38-41.