In 1980, Pan Am was combined with National Airlines. This was because Pan Am wanted to fly domestic flights and the government didn't allow it. When Pan Am bought National, it could finally fly domestically. In the 1980s, Pan Am started having many financial problems, having paid too much to buy National Airlines. Pan Am also spent too much money on the new Boeing 747s. The Gulf War of 1990 also caused many problems with Pan Am's transatlantic flights. Pan Am declared bankruptcy in January 1991. Delta Air Lines bought small parts of Pan Am and tried to help it. However, on December 4, 1991 Pan Am stopped flying due to the big financial problems. United Airlines got many of Pan Am's old flights. American Airlines got Pan Am's Miami hub. Pan Am was resurrected twice in 1996 and 1998.