Also in such range, imagine the apogee of the missile for loft glide or even some "ballistic" trajectory particularly if the apogee is in excess of 30 km. One concern is how they can provide control on the highest portion of the trajectory as fins become ineffective. Hit to kill ABM like say PAC-3 use reaction control with those fancy small thrusters.
Or maybe such control is not needed for air to air missile application, drawing from Russian testing on 400 km missile for S-300P (which eventually become 40N6) Apogee of 70 km was reached while range was 400 km. The missile's control surface is locked during the high altitude portion to prevent unwanted oscillations.
1000 km might probably reach Orbit, one then might have to think about Re-entry phase