Which distinctive design element was featured in Boeing's corporate logo from 1947 to 1997, before being replaced by the current simplified blue roundel?

The aviation industry has seen many iconic brands evolve over decades of transportation history. Boeing, one of the world's largest aerospace manufacturers, has undergone several logo transformations since its founding in 1916. This trivia question tests your knowledge of Boeing's visual brand identity and how it has represented itself in the competitive transportation marketplace. Can you identify the unique element that appeared in Boeing's logo during a specific era of its history?

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The 'Stratocruiser' wing design with three horizontal stripes
The 'Boeing Totem' - a Native American-inspired symbol
The 'Boeing Stratotype' - a cross-section of a jet engine
The 'Boeing Stratotype' - a stylized wing/globe design with horizontal stripes