a) Fewer aircraft explosions from gun damage. Most downed aircraft should simply fall from the sky and crash instead of the 'poofing' that happens now.
b) Improved bomb and rocket explosion sprites
c) Improved shock damage from larger bomb explosions (not blast radius, but air compression shock damage)
d) Real runway craters from bombs, rockets, or falling aircraft.
e) Aircraft wreckage from downed planes that appear for 30 minutes as a burning obstacle. Especially on carriers
f) Steerable parachutes