“As Hitler’s minister for armament, Speer ordered German factories to shove new aircraft, tanks, and weapons and munitions out the door for delivery in spite of defects and a lack of spare parts. At the end of the war, Germany was littered with thousands of derelict but factory new tanks and aircraft that could not be made operable. “
Well, maybe someone should have told the US Air Force that they were mistaken, and they were imagining large German fighter production.
The investigation of how large numbers of German fighters were being produced was the origin of the US Air Force “Heavy Press” program of the 1950’s.
starts at relevant section.
https://youtu.be/iZ50nZU3oG8?t=58
The expansion of production achieved in 1944 did not at any time lead to a significant increase in Luftwaffe frontline strength. No fully satisfactory answer has yet been produced for this problem. A large number of Luftwaffe records were destroyed and many of the surviving ones have been difficult to decipher. With confidence, one can say that a significant proportion of the expanded production that did not turn up in frontline strength was destroyed at the factory, in transit, on operational airfields, or in combat. The sources agree, however, that attrition did not account for the whole of the problem. The balance might be accounted for, in part, by declining standards of record-keeping in the last year of the war. Another explanation favored by USSBS investigators was that certain officials, chiefly Karl-Otto Saur, the head of the special Fighter Staff under Albert Speer, were not above altering the books to make their production efforts look better than they really were.