Can't remember the topic in which this came up, but I finally found a site that appears to have some numbers. Can't vouch for them and not making any particular point.
Just thought some of those curious folks might find this site interesting:
http://www.wargamer.com/articles/lldocefx.asp Lend-Lease Aircraft And Fuel
The Soviets produced an estimated 101,000 combat aircraft during the War, supplementing their airforce with an estimated 15,000 following list of Lend-Lease aircraft:
Single-Engine Fighters Shipped Lost In Transit Arrived
P-39/P-400 Aircobra 4,719 Unknown 3,200 est.
P-40F Kittyhawk 4,017 Unknown 2,975 est.
P-47C Thunderbolt 195 0 195
P-63 King Cobra 2,456 67 2,389
British Hurricane 2,952 Unknown 2,250 est.
British Spitfire 1,331 Unknown 1,000 est.
Twin-Engine Aircraft
A-20 Havoc (Various Versions) 2,908 Unknown 2,600 est.
B-25 Mitchell 862 Unknown 750 est.
British H-P Hampden 23 0 23
British A-W 41 Albemarle 14 0 14
C-47 Dakota Transports 8 0 8
In addition to these aircraft shipments, the Soviets received some training when
the planes arrived, usually when pilots delivered them. All of the arrived
numbers are an educated guess, due to incomplete bookkeeping,
shipping losses and contradictory sources.
As mentioned earlier the Allies shipped a total of 476,000 tons of 100 octane aviation fuel that was also one of the more important items received. Production of this fuel was necessary to considerably enhance aircraft performance. It required sophisticated refining equipment and advanced techniques of production that the Soviets were short of.
