This paper concerns the subject of air superiority; what it is, and most importantly which factors that contributes to the air superiority. A number of air power theorists and researchers have since the beginning of air warfare been pointing out the importance of air superiority and what this can lead to. It is often stated that air superiority sometimes is a must for success and once achieved victory is almost guaranteed. A number of underlying factors that can lead to air superiority has been listed earlier in previous studies and theoretical frameworks, but no systematic analyzes has ever been conducted before on how air superiority is achieved and to which extent these underlying factors lead to air superiority. The purpose of this paper is to examine the factors who contributed to the achievement of air superiority in the cases of Operation Desert Storm and Operation Deliberate Force. The result shows that all of the pre-known factors appeared in both of the two cases to some extent, but it also showed other previously unknown factors which contributed to the air superiority campaign. Out of these the most important is targeting and to neutralize the enemy air defense. Further this studie shows the importance of supporting air roles like surveillance, electronic warfare and air refueling. However, none of this can be conducted without professional and skilled personnel.