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A typical figure is about six secs for time of flight for a medium range AA gun and equates to around six to eight thousand yard range. Although the gun has over say twenty thousand yard range in AA it would not be used as a lot can happen after and up to six secs of flight for shells. High speed attacking aircraft and missiles suffer from the physics of inertia and cannot weave and fly about as a WW2 fighter attacking at two hundred knots despite what the salesmen claim.

With the increases of range in airborne missiles the trick is to detect the aircrafts radar in first sector search then lock on and then notice a slight change in frequency as the aircrafts missiles sector search and lock on while still on the aircraft. You then start jamming whatever missiles have been fired at you until within range of your missile and gun systems.

Missiles fired from aircraft where they fly to a predetermined point and then switch on their radar again and sector search are no where near as good as a missile that is locked on from an aircraft. Once a missile has locked on you are literally secs away from it hitting you.

Infrared and visual homers missiles come under close range targets and can be engaged with say seawolf, phalanx, goalkeeper systems. Though only seawolf has a reasonable range and the others you are engaging the target when very close and should be only looked upon as last ditch weapons.

Warship missile systems both long and short range are extremely expensive and take up large amounts of space. There is still a place for a medium range AA gun firing first chaff shells and then vt fuzed shells. Vt fuzed shells against a supersonic target used used to get in the region of 80 per cent target destroyed, but the ship was well away from land so no clutter and generally good weather conditions and the systems were set up correctly.