It is restricted airspace over the Falls area, which allows the helicopters and microlights to fly safely. The passenger airlines are not allowed to fly over the area. But as the airports in both Zambia and Zimbabwe are only about 20kms from the actual Falls, if you are on the right side of the airplane, you will see the rising plume of spray from the Falls as you approach the runways. It gets you excited but that's about all.
To get a good look at the Falls from the air you need to go on a helicopter flight or microlight.
