Which company's wartime production was promoted with the famous slogan "Keep 'Em Flying" during World War II?

During World War II, effective advertising slogans helped mobilize nations and promote war production. Many companies shifted their manufacturing to support the war effort, and their advertising reflected this patriotic pivot. Some of these wartime slogans became so iconic that they've entered our cultural lexicon and remain associated with these brands decades later. Test your knowledge of these powerful marketing messages that emerged from one of history's most significant conflicts.

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Boeing Aircraft Company
Curtiss-Wright Corporation
Lockheed Aircraft Corporation
North American Aviation