Douglas A-4 Skyhawks have a maximum takeoff weight of 24,500 lb, making the aircraft unsuitable as a bomber.
 A few experimental designs rely entirely on engine thrust to provide lift throughout the whole flight, including personal fan-lift hover platforms and jetpacks
A-4GEight aircraft built new for the Royal Australian Navy with minor variations from the A-4F; in particular, they were not fitted with the avionics "hump"

