well not only in terms of sheer numbers but in the fact that it was so important to Japan. How many planes did Japan have that they produced even 4K of? How many different ac did Soviet Russia or Us have that they made 4k, 5k+ of?
Just sticking to WW2 A/C that saw military use:
U.S.____
Consolidated B-24 Liberator: 18,482
North American P-51 Mustang: 16,766
Republic P-47 Thunderbolt: 15,686
Curtiss P-40 'hawk: 13,378
Boeing B-17 Flying Fortress: 12,731
Vought F4U Corsair: 12,571
Grumman F6F Hellkitten: 12,275
Lockheed P-38 Lightning: 10,037
North American B-25 Mitchell: 9,984
Grumman TBF Avenger: 9,837
Bell P-39 Airacobra: 9,584
Grumman F4F Wildkitten: 7,722
Douglas A20/DB-7: 7,478
Douglas SBD Dauntless: 5,936
Martin B-26 Marauder: 5,288
U.K.__
Supermarine Spitfire: 20,351
Hawker Hurricane: 14,527
Vickers Wellington: 11,461
Avro Anson: 11,029
de Havilland Mosquito: 7,781
Avro Lancaster: 7,377
Handley Page Halifax: 6,176
Bristol Beaufighter: 5,928
USSR___________
Polikarpov Po-2: Over 40,000
Ilyushin IL-2: 36,183
Yakovlev Yak-9: 16,769
Petlyakov Pe-2: 11,427
Lavochkin La-5: 9,920
Polikarpov I-16: 9,450
Yakovlev Yak-1: 8,720
Tupolev SB: 6,656
Polikarpov I-15: 6,519
Yakovlev Yak-7: 6,399
Lavochkin-Gorbunov-Gudkov LaGG-3: 6,258
Polikarpov R-5: 6,000
Lavochkin La-7: 5,753
Ilyushin IL-4: 5,200
Japanese Empire:
_____________________
Mitsubishi A6M Zero: 10,939
Nakajima Ki-43 Hayabusa: 5,919
Yokosuka K5Y: 5,770 (Mostly used as a trainer)
Nazi Germany_____________________
Messerschmitt Bf 109: 33,984
Focke-Wulf FW 190: More than 20,000
Junkers Ju-88: ~15,000
Heinkel He 111: 7,300
Messerschmitt Bf 110: 6,150
Junkers Ju 87: 6,000