Definition of air-to-ground 

: launched from an airplane or helicopter at a target on the ground : air-to-surface The United States has already armed its first generation of unmanned vehicles … with air-to-ground munitions and used them frequently in operations over the past decade.— Scott Jasper, Securing Freedom in the Global Commons, 2010 an air-to-ground attack

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First Known Use of air-to-ground

1935, in the meaning defined above

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The first known use of air-to-ground was in 1935

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something that serves to warn or remind

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