A-4F Sky Hawk - The A-4 Skyhawk was designed by Douglas in response to a US Navy call for a jet-powered attack aircraft to replace the older A-1 Skyraider. Douglas opted for a design that would minimize its size, weight, and complexity. The result was an aircraft that weighed only half of the Navys weight specification. It had a wing so compact that it did not need to be folded for carrier stowage. A-4F refinement of A-4E with extra avionics housed in a hump on the fuselage spine. This feature was later retrofitted to A-4Es and some A-4Cs and more powerful J52-P-8A engine with 9,300 lbf 41 kN of thrust, later upgraded in service to J52-P-408 with 11,200 lbf 50 kN, 147 built. Some served with the Blue Angels acrobatic team from 1973 to 1986.