Actually, today I think helicopters are the main tankbusters.

They have the ability to hoover out of sight, even lock their missiles out of sight (only a camera and radar sticking up about 1-2 meters above the heli), and then pop up, fire 4 missiles and then get down out of sight again... This all takes about 3-5 seconds depending on the skill of the pilot.

The benefit of helicopters over planes is that they are harder to spot, and conventional AA batteries supporting the tanks are ineffective.

This is still theoretical though, but it is the military doctrine Sweden follows after severe testing. However, not many real battles have showed this, yet, as this theory is based on a figth between equally technological forces.

And, it was a long time ago we saw that.