Just to be clear, Joltin Josie was not B-29A. There were three specific models of B-29 used in WWII. The B-29, B-29A, and B-29B were those models. The A model was only built in Boeing Renton and had a different wing root assembly than the other B-29 models. The B-29 (no suffix letter) was built in Boeing Witichita, Martin Omaha, and Bell Atlanta. The B-29B was only built at Bell Atlanta.