: The initial production variant. It featured a shorter wingspan (approx. 60 ft) and was powered by 1,200 hp Jumo 211B-1 engines. Combat during the Battle of Britain revealed it was under-armed and structurally limited for heavy maneuvers.
: The definitive and most widely produced bomber version. It addressed previous flaws with a larger wingspan (65 ft 7 in), reinforced airframe, and more powerful 1,400 hp Jumo 211J engines. Armament was significantly upgraded, often replacing MG 15 guns with high-rate MG 81 belt-fed machine guns or 13 mm MG 131s. Junkers Ju-88A: All models
The A-series was adapted for numerous niche roles beyond standard bombing: Junkers Ju88 A4 - A5 - Aircraft WWII - Britmodeller.com : The initial production variant