File photo taken on March, 2014 shows Chinese rescue vessel Nanhaijiu 101 on South China Sea. China announced on Dec. 29, 2014 that it will send aircraft and vessel to join the search and rescue work for missing AirAsia flight QZ8501. By far, a navy frigate on routine patrol in the South China Sea is heading for the waters where the jet went missing. Besides, Chinese patrol ship Haixun 31, rescue vessel Nanhaijiu 101 and Nanhaijiu 115 are also standing by. (Xinhua/Zhao Yingquan)