Which famous WWII aircraft manufacturer's advertising campaign featured the slogan "Keep 'Em Flying" that became one of the most successful wartime marketing campaigns?

During World War II, military equipment manufacturers launched groundbreaking advertising campaigns to both boost production morale and generate public support for the war effort. These campaigns not only promoted military products but also became iconic pieces of marketing history, influencing advertising strategies for decades to come. Test your knowledge about these historic military advertising campaigns that helped shape both military history and marketing practices.

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Lockheed Martin with their P-38 Lightning fighter
Boeing with their B-17 Flying Fortress bomber
Curtiss-Wright Corporation with their P-40 Warhawk fighter
North American Aviation with their P-51 Mustang fighter