They are used to transport extra-large items. I missed seeing one used years ago on a project I was working on.
Doesn’t airbus have a mfg facility in Alabama?
I saw one over Detroit 20 years or so ago. It was delivering some massive machine tool assemblies from Germany for a GM engine plant project that it just so happened that I was also working on. Thing is so huge that it was hard to judge how far away it was. German vendor was running late, and hiring the Antonov let them make up some time. Unlike the government, the auto industry in utterly unforgiving about slipped delivery dates.