Good morning, My guess would be that you were seeing a turkey vulture. They have two-toned black wings; their flight feathers are lighter. Younger birds have gray heads. But given distance and light conditions it can be difficult to make out the red head of an adult. If the bird was large and soaring while holding its wings in a shallow V shape you can be pretty sure it was a turkey vulture. They rarely flap their wings, and they appear to have a rocking motion when they are soaring.
