Based on the search results, "PLA jet" refers to a fighter aircraft flown by the Peoples Liberation Army Air Force (PLAAF) of China. The PLAAF is an aerial service branch of the Peoples Liberation Army, the military force of the Peoples Republic of China. The PLAAF has been involved in several incidents with US aircraft in international airspace, including flying within 20 feet of the nose of a US aircraft over the South China Sea.