Airlines ground some cargo planes to ride out capacity and rate turbulence. By Jon Ross At the beginning of December, officials at Singapore Airlines Cargo said goodbye to one of their 13 Boeing 747-400 freighters, taking it out of the sky with the hope to keep it grounded for at least a year, possibly two years. The freighter market had dealt SIA a tough hand, and due to weak demand for freighter services and high fuel prices, officials took t...