Gilpin Airlines, formally re-incorporated in 1932 as G & G Gilpin Air Lines Company was an air charter and airline company operated in California, Arizona, and the Mexican states of Sonora and Baja California from 1929 to 1934. A residual of the company persisted in Arizona as a flight school and charter business, operating out of Gilpin Field in Tucson, Arizona for several years. The airline is notable for its ownership by Arizona pioneer and politician Isabella Greenway, and for its involvement with trans-border traffic during the days of Prohibition.