I’m glad you reminded me that it was the B-24 that was built at Willow Run, at least some of them.
I had another uncle who flew the Navy version, the PB4Y off of Tinian Island beginning 70 years ago about now! He was flying against the Japanese Navy picket ships defending the home islands.
I just looked it up and the Navy versions of the B-24 was built in San Diego.
http://en.wikipedia.org/wiki/Consolidated_B-24_Liberator
I usually get to see a WWII bomber about once a year. This seems to be a popular area for them to put on shows.