Idled China Southern MD-80s

These four China Southern MD-80s were parked on the tarmac of the Sanya Airport (SYX) for at least 3 hours on Monday. I think its just a sign that even with air traffic booming in China they still have dismal aircraft usage - a Dragonair flight arrived and departed in a matter of 30-minutes while my China Southern flight spent an hour on the ground before turning around. Such inefficiency!