I work in a facility that started out as a B-24 factory here in San Diego. I know there was at least one other B-24 plant, in Texas I think. If there were only two, then I guess there’s a 50/50 chance some of the airplanes your acquaintance flew in where built here. (The building I’m in was also, as far as fabrication goes, last used to build Delta rocket fuel and/or oxidizer tanks.)