There are typically a limited number of flights for them to the US simply because there are only so many flights that require such a craft…they aren’t as rare as a dreamlifter or a beluga or the super guppy on a numbers basis…but one basically over town I’m guessing over the entire history of them is somewhere a handful of times at best and this being the only time so far. Most flights are international and from good sized airports…much less common for flights between states too.