There's a delay between production start and start of operational use. They had to be shipped to Europe first.
WitE dev team - (aircraft data)
WitE 1.08+ dev team (data/scenario maintainer)
WitW dev team (aircraft data, partial data/scenario maintainer)
WitE2 dev team (aircraft data)
Game-wise deliveries are instant but usage is prohibited until the block is lifted. Then all amassed in pool become usable.
Not the best solution but the best possible within the game engine limits.
WitE dev team - (aircraft data)
WitE 1.08+ dev team (data/scenario maintainer)
WitW dev team (aircraft data, partial data/scenario maintainer)
WitE2 dev team (aircraft data)
Sound ridiculous, there should be a constant flow until the new model arrives, in this case they even sent field mod kits to upgrade the -5 & -10 to -15 standard.
Its another poorly thought through solution.
Interdum feror cupidine partium magnarum Europae vincendarum
On the other hand you are free to switch from outdated a/c like P-39/-40 to high performance P-47/P-51 without having to spend some months for familiarization/retraining onto the new a/c.
WitE dev team - (aircraft data)
WitE 1.08+ dev team (data/scenario maintainer)
WitW dev team (aircraft data, partial data/scenario maintainer)
WitE2 dev team (aircraft data)