This is a photograph of the Lockheed L-188 Electra II, the first U.S. turboprop-powered aircraft. American Airlines began flying them in 1959. However, wing failures caused by excessive vibration resulted in several fatal accidents and flight restrictions. Lockheed solved the problem, but sales plunged. By the time Electras returned to full service, jetliners had superseded them.
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Smithsonian National Air and Space Museum