A-4 Skyhawk VMA-331 airplane model. The A-4 Skyhawk is a lightweight, single engine attack aircraft, with a design based on experience gained in the Korean War. The "Scooter" is probably one of the most famous attack aircraft ever designed. This short-range attack and close support aircraft was originally intended for the US Navy and Marine forces. The design was a quick success, and Skyhawks continue to fly in air forces around the world. There are numerous models of the A-4 in use. All models have two internally mounted 20mm cannons and are capable of delivering conventional and nuclear weapons under day and night visual meteorological conditions. The aircraft is a very compact design, with no wasted space. The structure is a conventional all metal semi monocoque type. Fitted with automatically operated wing slats and hydraulically operated split flaps. Folding wings were not provided.