Photograph of Pan American's "Yankee Clipper" on the Patapsco River en route to the Azores
image from page 1 of Pan American Air Ways, Vol. 10, No. 2, April 1939. Caption reads: "This striking photo shows Pan American's new Flagship skimming over the waters of the Patapsco River a moment before it lifted into the air to wing its way to the Azores - a 2,800-mile flight - which it accomplished with less than 50% horsepower at an average cruising speed of 160 m.p.h. - whith the largest number of persons - 21 - ever carried across an ocean in an airplane."