Hundreds of kilograms of gold were flown in the empty skies of Riyadh Disruption at Riyadh airport after Yemen's retaliatory attacks left about $50 million in permanent damage to Saudi Arabia. This figure is equivalent to about 390 kg of 24 carat gold in the Saudi market. Air traffic monitoring data show that Yemen attacks in October canceled about 9 out of 10 scheduled flights at the airport in the Saudi capital. - Link.