Black bird of prey
I wish I had a photo, but I don't have a camera powerful enough to get one.
There are majestic black birds, quite large, that remind me a lot of the bald eagles I am familiar with, but they seem larger. They are black from head to tail, with yellow beaks, and lighter, almost whitish feathers on the underside of their wings. They're larger than the turkey vultures we see all the time out here, though, if one's not paying close enough attention, one can easily pass them over for just that. They fly solitary, though sometimes, one can see a mate or hunting partner off in the distance - their circling may overlap, but they're circling their own areas.
It's occurred to me they may be juvenile bald eagles, but a)the ones I saw in Northeastern Kansas were never too terribly far from their parents, and I have yet to see a full-grown bald eagle here yet; and b)like I said before, they seem bigger. Can't get them close enough to find out for sure! :)
I live in south-central Missouri, right on the border.