 This causes the aircraft to spiral to the ground, but by pressing either "up" or "down" key, one may manage to slow down enough to have time to wake up and regain control before crashing.This ceiling is indicated by the top of each of the 3 segments in VESA SVGA mode, or the top of the player's screen when it refuses to move up any more in VGA mode, or the top of the screen in Single Player.In single player, the player generally has a number of planes at their disposal.