...or the building sound of the air rushing past the cockpit as you dive on a foe.
I've said this before, but the game will feel completely different with a proper sound engine and sound effects. Sound has a huge psychological effect, in Cliffs of Dover case its been one of the main missing factors in terms of feeling immersed in your aircraft. We already have the ridiculously detailed cockpits but its only half-complete until you add all the sounds that goes with flying it.