I never really paid much attention to what the differences were. The local I worked out of was a maintenance local 2295 out of LA. I worked there for 32 years in the same plant. I think your right it was BA but I cant be sure. All I know is most of the A members had electronics backgrounds and only a few of them actually worked construction or held JW status. The union steward was an A and a few of his close friends were as well. Don't get me wrong we were all close as we worked together for several years and depended on each other. The A electricians ran the show so to speak because the most important part of maintenance was keeping the machine tools running, especially the NC machines. So the card carrying members mostly B's from non union backgrounds would be assigned to infrastructure and light construction and conventional machines. As for a pension from the union I have no idea what the A members received but BA members like myself got zero. Although I did get a healthy pension form Boeing so it's probably a different ball game than what you guys deal with.