This is the Lockheed-Orion Model 9E Special, NC122823, formerly owned by TWA, that was modified by Wiley Post for his trip to Alaska. Among other modifications, Post replaced the engine with a 550 horsepower type, installed a three-bladed variable pitch propeller, swapped out the wing with one that was six feet longer from a Lockheed-Explorer Model 7 Special, NR101W, that had fixed landing gear, and then replaced the landing gear with floats.