One of the SVZ's first air battles was in the Slovak–Hungarian War in March 1939 in which Hungary occupied Carpathian Ruthenia and parts of southern Slovakia.
In this the SVZ suffered some losses against Royal Hungarian Air Force.
The symbol of the Slovak air force was a blue and white cross similar to the German Balkenkreuz, with a red disc in the centre.
Engine covers were painted yellow and there was a vertical line on the fuselage.
When Romania and the Soviet Union entered Slovakia, with some captured aircraft and defectors they organized a local Insurgent Air Force to continue the fight against Axis forces in country.