image/svg+xmlOpenclipartairfield2008-01-24T01:22:06symbol for U.S. national park maps. PD US Government - National Park Service, U.S. Dept. of the Interiorhttps://openclipart.org/detail/11586/airfield-by-johnny_automaticjohnny_automaticairportcartographyexternalsourcemapparkpictographsymbol