Some production numbers here (just googling, so correct me if I'm wrong)
British production:
Spitfire Mk II production: 920
Spitfire Mk V production: 6,479
Spitfire Mk IX production: 5,665
Spitfire Mk VIII production: 1,658
Hurricane Mk II production: 8,600 (451 Mk IIA, 2,948 Mk IIB, 4,711 Mk IIC, 296 Mk IID, 270 Mk IV)
Boulton Paul Defiant produced (through 1943 !!): 1,064
Hawker Henley: 202
Armstrong Witworth Whitley: 1,814
Avro Manchester: 209
Beaufighter Mk II: 448
US Production:
P-40F and L (total): 1,831
P-40 (Allison types) prior to 1944: 7,570
P-38 Lightning (1942-43): 3,212 (1019 in 1942, 2,193 in 1943)
P-47 Thunderbolt (1942-43): ~3,000 (includes 171 B and 602 C which I don't think were combat ready)
P-51A Mustang + A-36 (1942-43): 810 (500 A-36, 310 P-51A)
P-51B and C (I couldn't find the number for 1943, hopefully one of our P-51 experts here has it?)
F4U production in 1943: ~ 1,200 (not sure how many of these were really combat ready types)
F4F / FM1 Wildcat / Martlet production 1942-43: 3,138 (1,988 from Grumman, 1,150 from GM)
F6F Hellcat production 1943: 2,545 (I believe these were all F6F-3)
P-39 Airacobra production through 1943: ~8,000
Losses -
Luftwaffe losses in North Africa 1942-43: ~3,000 (600-700 aircraft in action or accidents, 2,400 counting aircraft left on airfields etc.)
Regia Aeronautica North Africa aircraft losses 1942-43: 400-500 aircraft + unknown (or i couldn't find data) for left behind / lost on the ground
Luftwaffe + Regia losses Sicily campaign 1943: 2,011 (320 (225 German and 95 Italian) in action or operational, 1,691 lost due to captured airfields etc.)
RAF / DAF losses North Africa 1,800-2,000 aircraft
USAAF losses North Africa ~1,800 aircraft
Combined Allied aircraft losses Sicily ~200-300 aircraft (including 140 US)
RAF aircraft losses Burma and India (through 1945): ~ 1,300 aircraft
US aircraft losses CBI (through 1945): ~600-700 aircraft
Google also claims that Regia Aeronautica lost 5,200 aircraft between June 1940 Sept 1943, and Luftwaffe 3,540 aircraft. Presumably most of these were lost on the ground / abandoned.
Comments:
- I could not find the total number of Luftwaffe losses in fighting over the channel in 1942-43, but I would bet you a beer it's less than what they lost in the MTO, mainly because of all the captured and abandoned aircraft lost as a result of the Allies taking ground. The ability to capture enemy controlled territory was a major advantage of the fighting in the MTO for the Allies.
- Just taking a wild guess here, but I would bet a beer that about 5,000 of those 8,000 Hurricane Mk II were 'extra', as were about 3,000 of the Spitfire Mk V. If we can assume that something better in terms of performance and range could have been possible in time to be fielded in 1942-43. If not I'd say swap Hurricane production for Spitfire as we already discussed.
- The reason being that both Hurricane and Spit V were extremely limited in both range and endurance. This was a big problem for both in North Africa, and in Burma and India, and for the Spit V in Australia. It basically prevented it's active use in the South Pacific Island campaigns which could have been a very helpful contribution. The Spit VIII, for all it's capabilities, did not have a huge combat advantage over the Ki-43 and other JAAF fighter aircraft, but it did have an advantage and more importantly allowed the British to bring the fight to the Japanese more than ever before in the campaign.
- I will also guess that 4,000 of the 8,000 Airacobras produced could have been skipped. The ones that were built should have been sent to the Soviets.
- Probably half of the P-40E, K, M and N could have been better replaced by F/L types. The F/L was viable in the MTO through early 1944 and would have been useful in the South Pacific and China / Burma / India through the end of the war.
- The CBI was a truly tertiary Theater of War for the British, their only real necessity there was to protect India which was in fact threatened for a minute at the end. The US had their own reasons but it was not as important as the PTO or Europe for them either. But MTO was not so trivial, Suez canal, Egypt, the supply route to India etc., and the middle eastern oil (both keeping it and denying it to the Axis) were all very important. It also served as a useful Theater for damaging the Axis armies, building up British and American land fighting capabilities, and knocking Italy out of the war which I think was a bigger deal than people usually acknowledge. El Alamein and Italy's collapse were both major losses to German prestige and morale.
- There was some degree (we can debate how much) of squandering of the Merlin XX engines
- There was a shortage of the best US and British fighter aircraft through the end of 1943 - especially the Spitfire Mk VIII, P-38, F4U, and P-40F/L. I was quite surprised by the large number of F6F produced (if that number is correct) but if it is correct, it seems like more of these could have been deployed by the USN sooner and given to the British sooner. The P-47 was arriving in some numbers though as we know it took a while to iron out some of the problems with the type. But you can see in the production numbers a hidden value of this aircraft. Quantity has a quality all it's own, up to a certain point. Definitely more useful than Hurricane IIs or P-39s.