If they were able to produce those piston engine planes in thousands every month in 1940's when we couldn't even produce that many slippers in the same time, trust me if they need to, they will do even better now with so much advancement in production technology.
300,000 planes
By the end of the war US factories had produced
300,000 planes, and by 1944 had produced two-thirds of the Allied military equipment used in the war — bringing military forces into play in North and South America, the Caribbean, the Atlantic, Western Europe and the Pacific.
Military production during World War II - Wikipedia
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