Every year around Memorial Day here in the US I am overflown by WWII era aircraft. They fly out of Livermore, CA airport onto events in the bay area.

Here we have Liberator, version B-24J

(B-24J (s/n 44-44052) Witchcraft is owned by the Collings Foundation in Stow, Massachusetts.)

Wiki: The B-24J was very similar to the B-24H, but shortages of the Emerson nose turret required use of a modified, hydraulically powered Consolidated A-6 turret in most J model aircraft built at Consolidated's San Diego and Fort Worth factories. The B-24J featured an improved autopilot (type C-1) and a bombsight of the M-1 series. B-24H sub-assemblies made by Ford and constructed by other companies and any model with a C-1 or M-1 retrofit, were all designated B-24J. The J model was the only version to be built by all five* factories involved in B-24 production. (Total: 6,678)

* Consolidated Aircraft in San Diego CA.
* Consolidated Aircraft in Fort Worth, Texas.
* Douglas Aircraft in Tulsa, Oklahoma.
* North American Aviation in Dallas, Texas.
* Ford Motor Company at Willow Run near Detroit, Michigan.

The entire production run of the B-24 occurred between 1940 and 1945 (1,825 total days) resulted in 18,482 aircraft.

At its peak, the Willow Run plant produced 650 B-24s per month in 1944. By 1945, Ford made 70% of all B-24s in two nine-hour shifts. Pilots and crews slept on 1,300 cots at Willow Run waiting for their B-24s to roll off the assembly line.