Board Thread:General Discussion/@comment-25142096-20140927184716/@comment-25142096-20141002185834

The lock-on time is the same for all the classes, while the homing system is incredibly good on the fighters, mediocre on the multiroles and almost non-existant in the attackers.

You can verify it in the test flight by shooting ground targets while aiming upwards; the attackers' missiles will go almost straight, the multiroles' ones will try to seek the target but will most likely miss, and the with the fighters they'll almost always hit the target.

It may also depend on the aircraft's level, but I'm not sure about that.