data:extend(
{
  {
    type = "bool-setting",
    name = "aircraft-sound-setting",
    setting_type = "startup",
    default_value = true,
    per_user = false,
  },
  {
	type = "bool-setting",
	name = "aircraft-hardmode",
	setting_type = "startup",
	default_value = false,
	per_user = false,
  },
})