File:1923 Landing facilities and proposed airway system in the United States, by the United States Army Air Service, from the Digital Commonwealth - commonwealth jh343z06d.jpg
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![File:1923 Landing facilities and proposed airway system in the United States, by the United States Army Air Service, from the Digital Commonwealth - commonwealth jh343z06d.jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/f/f4/1923_Landing_facilities_and_proposed_airway_system_in_the_United_States%2C_by_the_United_States_Army_Air_Service%2C_from_the_Digital_Commonwealth_-_commonwealth_jh343z06d.jpg/800px-thumbnail.jpg?20211218163333)
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