Question: 泛美航空公司什么时候倒闭的
Answer: 1991; 1991; 1991-12-04; 04 十二月 1991; 1991 十二月 04; 12/04/1991; 1991 12 04; 1991 december, 04; 04/12/1991; 12 04 1991; 1991-12-04; 04 12 1991; 04-12-1991; 12-04-1991