
St Augustine Airport (KSGJ/UST) in the US is a civil airfield featuring a mix of asphalt and water runways. Its primary asphalt runway 13/31 stretches 2,437 meters, suitable for various aircraft, while the water runways 18/36 offer unique seaplane operations. At just 3 meters elevation, it supports both VFR and IFR traffic with multiple communication frequencies including Jacksonville Approach and ATIS, making it a versatile airport for aviation enthusiasts and pilots.