On January 16, 1942, Lombard was a passenger on Transcontinental and Western Air Flight 3 with her mother and press agent Otto Winkler. She had just finished her 57th movie, "To Be or Not to Be", and was on her way home from a successful war bond selling tour when the flight's DC-3 airliner crashed into Potosi Mountain near Las Vegas, Nevada, killing all 22 passengers aboard, including 15 servicemen en route to training in California. Gable flew to the crash site to claim the bodies of his wife, mother-in-law, and Winkler, who had been the best man at Gable and Lombard's wedding. Lombard was declared to be the first war-related American female casualty of World War II, and Gable received a personal note of condolence from President Roosevelt. The Civil Aeronautics Board investigation into the crash concluded that pilot error was its cause.