The invention relates to a method for decision support of a first combat aircraft (1) in a combat situation comprising the steps of: a) detecting (3) a second combat aircraft (2), wherein the second combat aircraft (2) is different from the first combat aircraft (1), b) analyzing (4) the second combat aircraft (2) to determine its type, its sensor capacity and its total weapons capacity, and c) recording (5) the sensor capacity and the total weapons capacity of the second combat aircraft (2) to determine a first geographic zone adapted for defining the detection limit of the second combat aircraft (2) and a second geographic zone adapted for defining a shoot-down limit of the second combat aircraft (2), respectively, wherein the first and the second geographic zone are adapted for decision support of the first combat aircraft (1) in the combat situation with the second combat aircraft (2). In this way, a possibility is provided to assist the pilot in decision support in complicated combat situations while being reliable, fast and easy to handle for the pilot in order to make a quick and efficient decision.