Let's say there is a case like UA1175: - they can see how damaged the engine is - they can see if the wing is damaged in any way (over and under) - is there any other damage to the aircraft (like there was a piece of shrapnel that hit the plane)

In other situations: - are the wheels out when the sensors say they are not - have a way to visually inspect critical parts of the plane while in flight (so you don't have to do a flyover and the tower to look with binoculars at the airplane)

This is what comes to mind now.

Happy? Or am I still dancing?