The big round sphere was just an out of focus bit.
Depending on direction, it was either Venus, Jupiter, or Mars.
They are all currently very bright, and, very noticeable.
Need more information on direction and time.
Do planets normally show up on radar.
The pilots and crew of the aircraft were advised of the object/orb by Miami air traffic control. I don’t think ATC would be advising aircraft of planets. Do you?
I don't think the FAA radars can detect that far.