Lockheed Model 10 Electra, NC233Y, Northwest Airlines fleet number 60, prototype, before modification 2 (SDASM) Published on February 22, 2014 in 24 February 1934Full resolution (1775 × 996) Next → The prototype Lockheed Model 10 Electra, NC233Y, after delivery to Northwest Airways, St. Paul, Minnesota. Note the forward slant of the cockpit windshield. (San Diego Air and Space Museum Archives)