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 SVZ also took part in the German Invasion of Poland.
The SVZ took part in Axis offensives in the Ukraine and Russian Central front sectors of the Eastern Front under the lead of Luftwaffe in the Stalingrad and Caucasus operations. The engagement in the cost it great losses of aircraft and personnel.
For the rest of the war the SVZ fought US Army Air Forces and Royal Air Force raids against Slovakia.
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. It was carried on the tail and wings. Engine covers were painted yellow and there was a vertical line on the fuselage.
Training aircraft were supplied by Germany and Italy. To defend Slovak air space, the air force used Messerschmitt Bf 109 (E and G types), Avia B-534, and some other interceptor types. It was also helped by Luftwaffe units active in the area.
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.[citation needed] Others served voluntarily in Luftwaffe units;[citation needed] later these air units were integrated to the reconstituted Czechoslovak Air Force[clarification needed] after the end of the war.
Aircraft of the Slovak Air Force
Arado Ar 96B-5
Bücker Bü 131B Jungmann
Bücker Bü 133 Jungmeister
Bücker Bü 181D Bestmann
Fieseler Fi 156C-2
Focke-Wulf Fw 44C Stieglitz
Focke-Wulf Fw 58C Weihe
Focke-Wulf Fw 189A-1 Uhu
Gotha Go 145C
Heinkel He 72B-1 Kadett
Heinkel He 111H-3 (5 He 111s were in Slovaks hands 2 were He 111 H-10s and 3 were He 111 H-16s)
Junkers W 34h (At least 1 confirmed to be in Slovak hands WW2)
Junkers Ju 52/3m g7e
Junkers Ju 87D-3 (10 Ju 87D-3s were in Slovak hands in WW2)
Klemm Kl 35D
Messerschmitt Bf 109E-7 (30 planes in Slovak hands WW2)
Messerschmitt Bf 109G-6 (30 planes in Slovak hands WW2)
Siebel Fh 104 Hallore
Siebel Si 204A
Avia B-71 (single Avia B-71 aircraft until April 18, 1943, when čtk Anton Vanko and four other airmen defected with it to Turkey[2])
Avia B.122 (~65 in Slovak service)
Avia BH-33E
Avia B-534
Aero A.100
Aero Ab-101
Aero A.300
Aero A.304
Aero AP-32
Beneš-Mráz Be-50 Beta-Minor
Letov Š-231
Letov Š-328
Praga E-39
Praga A/B-32 Pardubitz
Praga E-51
Praga E-210
Praga E-240
Zlín Z-XV
Zlín Z-XII
Caudron C.445 Goeland
Avro 626
Savoia-Marchetti SM.84bis (10 in Slovak hands WW2)

These were primarily assigned to Letecky Pluk (Air Regiment) 3 and numbered 79 Avia B-534 and 11 Bk-534 biplane fighters, 73 Letov S-328 biplane observation, and 15 Aero A-100 and Ab-101 biplane reconnaissance aircraft plus a miscellany of trainers and other minor types. However, it also had three bombers, a Bloch MB-200, a Fokker F.VII and a Avia B-71, a license-built copy of the SB-2 light bomber. Such a large number of Czech airmen departed for the German-occupied Protectorate of Bohemia-Moravia that the Slovaks were forced to reduce the numbers of squadrons to more sustainable levels. The original 5 fighter pletky (squadrons) were reduced to 3, numbers 11, 12, and 13 while the 7 original reconnaissance and observation pletky were consolidated into 3, numbered 1st, 2nd, and 3rd.