The P-39 was HATED by the Americans so they offloaded pretty much all of them to the Soviets. The Soviets tore up the sky with the P-39, producing many Soviet aces.
Because of these Soviet pilots, the Bell P-39 Airacobra has the highest number of kills attributed to any U.S. fighter type flown by any air force in any conflict.
:stalin-approval:
The P-39 was a hunk of junk. Short range, no supercharger so low altitude only, the Americans dumped them as soon as they found out how terrible they were. What Bell delivered was simply garbage compared with what was promised. They were outdated by June 1941. The Soviets used these third-rate castoffs only because the cupboard was bare.