Is it really that easy to shoot down a baloon at these heights? From what I've read it's travelling at about 100,000 feet, thats well above the flight ceiling of any US fighter so those should be out of the question. It will have a minimal IR signature so missiles with IR seekers will probably be out of the question too. When it comes to radar guided missiles I think they are designed so that the object they are locking on to needs to move at a different speed relative to it's surrounding, this is to sepparete the echo from different types of clutter, this baloon is travelling with the wind and I'm not sure any radar guided missiles would even lock on to it.