So we are looking at claimed victories i assume rather than actual victories
Some figures for consideration
18 December 1939 Luftwaffe and Royal Air Force During the Battle of the Heligoland Bight German fighters claimed 38 Vickers Wellington bombers shot down. Actual British losses were 12. The bombers gunners claimed 12 German fighters. Just three were recorded as shot down.
10 July 1940 Luftwaffe III./ZG 76 claimed 12 Hawker Hurricanes. The RAF lost just one Hurricane that day, in a collision with a Dornier Do 17
13 July 1940 Royal Air Force No. 56 Squadron RAF claimed seven Ju 87s from Sturzkampfgeschwader 1 destroyed over Portland. StG 1 recorded the loss of only two Ju 87s shot down. However 5 others were subsequently scrapped
12 August 1940 Luftwaffe The Germans claimed 22 British aircraft destroyed, actual British losses were 3. In one engagement Bf 109s from JG 2 claimed six RAF fighters, while bombers from KG 54 claimed 14. Only one fighter was shot down and six damaged (3 later scrapped).
18 August 1940 Luftwaffe The Germans claimed 147 British aircraft destroyed, actual recorded British losses were 68.
15 September 1940 Royal Air Force On the day termed as "the Battle of Britain Day", the RAF claimed 185 German aircraft shot down. German recorded losses were 60.
1940 Luftwaffe Overall, German claims for British fighters destroyed during the Battle of Britain was 3,058 against recorded losses of 915 - 334% overclaiming, compared with RAF overclaiming of about 155%[. This, coupled with underestimation of British production, had severe intelligence repercussions.
June 1941 - December 1941 Red Air Force In this time the Voenno-Vozdushnye Sily of the South Western Front claimed 85 Bf 109s. A further 53 were claimed by anti-aircraft units in October and another 54 in November. Only 31 Bf 109s were recorded as lost by the Luftwaffe in this period 9though a further 30 were subsequently scrapped) . VVS claims on the Eastern Front amount to 3,879. Anti-aircraft units claimed a further 752. A further 3,257 were claimed on the ground. The Luftwaffe reported the loss of 3,827 aircraft to all causes on the Eastern Front in 1941, making VVS overclaiming more than 100%.
June 1941 - December 1941 Royal Air Force During this period RAF Fighter Command launched a sustained 'fighter offensive' over Northern Europe, designed to tie down Luftwaffe fighter units, and hence indirectly take pressure off the Eastern Front, and to hopefully draw those Luftwaffe units encountered into a war of attrition. Fighting exclusively over enemy territory, and thus usually unable to accurately verify their pilot's combat reports, Fighter Command claimed 711 Luftwaffe fighters shot down, while losing 411 of its own fighters. The loss to JG 2 and JG 26, the principal opponents, were reportedly just 103 fighters (but there were additional losses sustained due to more detailed damage assessments, ie taken out group control and sent to the rear for repair, but not actually repaired)
8 June 1942 Red Air Force: 6 GIAP/VVS ChF This unit claimed nine German aircraft shot down in a single action. Not a single German aircraft of any type recorded as lost.
20 July 1942 - 10 August 1942 Luftwaffe During this period Fliegerkorps VIII claimed to shot down 606 Soviet aircraft while destroying another 107 on the ground. In fact the actual losses of VVS were 230 aircraft - 114 fighters, 70 Shturmoviks, 29 Pe-2s, four Su-2s and 13 night bombers. This includes all losses that are known
26 July 1942 Red Air Force: 434 IAP and 512 IAP These units claimed 18 and 12 kills against Macchi C.200s of the Italian 21 Gruppo Autonomo C.T. during the Fall Blau operation. The Italian unit lost three Macchi in total.
15 September 1942 Luftwaffe
Desert Air Force Jagdgeschwader 27 claimed 19-20 aerial victories while Royal Australian Air Force and RAF records report the loss of 3 aircraft (a further Allied fighter was lost due to friendly ground fire and one additional a/c was scrapped due to damage). The Allies claimed two destroyed, two probables and three damaged in the same engagement. The Germans lost Lt. Hoffmann of I. Gruppe and Uffz. Prien to a midair collision, killing Prien. No further losses had been reported.
15 December 1942 IJAAF Burma: 50th Sentai pilots submitted claims for six Hawker Hurricanes shot down over Chittagong. Not one Hurricane was even damaged.
25 December 1942 United States Army Air Force Burma: 16th Fighter Squadron, 23rd Fighter Group pilots submitted claims for ten enemy aircraft shot down, five probables and one damaged. The 64th Sentai lost one Ki-43 and three Ki-48 from 8th Sentai were damaged.
17 April 1943 United States Army Air Force: 91st, 306th Bomb Groups During a mission against the Focke Wulf plant near Bremen, The Americans claimed 63 German fighters destroyed in aerial combat, plus 15 probable and 17 damaged. Only two were destroyed by enemy action, with nine damaged (5 subsequently scrapped).
2 March 1943 No. 54 Squadron RAF No. 457 Squadron RAAF; 202nd Kokutai, Imperial Japanese Navy Air Service Each side claimed three enemy aircraft destroyed. Neither side suffered any losses.
5 July 1943 - 8 July 1943 Red Air Force: 2.VA, and 16.VA During the Battle of Kursk, the Soviet unit 2.VA claimed 487 aircraft from Fliegerkorps VIII shot down. German records show the Luftwaffe lost only 41. According to the Generalquartiemeister der Luftwaffe 58 were lost to all causes. The 16 VA unit claimed 391 against Luftflotte 6. Actual losses were 39. The Soviets claimed a total of 878 German aircraft destroyed. Losses were 97. However these are immediate combat losses. LW losses were basically doubled due to susbsequent scrappings due damage
17 August 1943 United States Army Air Force, Luftwaffe After the Schweinfurt-Regensburg mission Gunners on the bombers claimed 288 fighters shot down. Spitfire pilots claimed another 7 German fighters shot down and P-47 pilots claimed 14. Luftwaffe records show 40 aircraft lost. The Luftwaffe claimed 101 bombers and five fighters shot down, however only 60 B-17s and no fighters were reported lost. however, there were a large number of bombers so badly damaged they never flew again
14 October 1943 United States Army Air Force, Luftwaffe After the Second Raid on Schweinfurt Gunners aboard the B-17 bombers claimed to have shot down 138 German fighters. German records state only 38 were lost. German fighters claimed 121 bombers, the actual figure was 60. Again many additional aircraft were scrapped due to damage, on both sides
6 January 1944 United States Army Air Force On this date bomber crews claimed 210 German fighters and their escorts claiming 31, for a total of 241 claims. German losses amounted to 39 in total.
3 March 1944 United States Army Air Force, Luftwaffe On a bombing mission to Berlin the Eighth Air Force dispatched the 1st and 2nd Air Divisions, comprising 95th, 100th and 390th Bomb Groups. The B-17 gunners claimed 97 German fighters on this mission. American fighters claimed a further 82 destroyed. German losses amounted to 66. German claims amounted to 108 bombers and 20 fighters. USAAF losses were 69 bombers and 11 fighters.
14 June 1944 United States Army Air Force During the Oil Campaign of World War II fifteen P-38 Lightning escorts from 49th Squadron, 14 FG was engaged by 32 Bf 109G-6s from the 101. Honi Légvédelmi Vadászrepülő Osztály, Royal Hungarian Air Force over central Hungary. American fighter pilots reported 13 Bf 109s destroyed, 1 probable destroyed and 5 damaged. In the preliminary report the Hungarian fighter pilots filed claims for twelve probably destroyed P-38s, and ultimately filed claims for seven; five were eventually claimed confirmed.
The actual losses of the day: five P-38s were shot down, with pilots MIA, two were severely damaged while several aircraft were lightly damaged; one Bf 109G was destroyed in air combat (pilot KIA), one Bf 109G destroyed during forced landing as a result of air combat (pilot safe); one Bf 109G damaged during a landing accident.
18 June 1944 Luftwaffe The Luftwaffe claimed 39 B-24s and five P-51s shot down over Schleswig-Holstein. Just 13 B-24s and two P-51s were lost.
1944 - 1945 Luftwaffe Oberleutnant Kurt Welter, claimed perhaps 25 Mosquitoes shot down by night and two further Mosquitoes by day while flying the Me 262, adding to his previous seven Mosquito kills in "hot-rodded" Bf 109G-6/AS or Fw 190 A-8 fighters. As far as can be ascertained, three of his Me 262 claims over Mosquitoes coincide with RAF records.
1 January 1945 Luftwaffe On this date German pilots overclaimed by between 4 and 3:1 . During Operation Bodenplatte the Luftwaffe claimed 55 destroyed and 11 probably destroyed in air-to-air combat (according to document: "Fernschreiben II.JakoIc Nr.140/44 geh.vom 3.1.1945"). Other German sources (according to document: "Luftwaffenführungsstab Ic, Fremde Luftwaffen West, Nr. 1160/45 g.Kdos.vom 25.2.1945"), quote 65 claims and 12 probables. Just 31 Allied aircraft were hit. 15 were shot down in aerial combat, two were destroyed whilst on take-off and seven were damaged by enemy action. 3 of the dmaged aircraft were scrapped.