It has been a difficult year for employees and customers of Northwest Airlines. *A strike, preceded by months of deteriorating customer service. *Thousands of angry workers...thousands more furious customers and no indication 1999 will hold any improvement. Two of Northwest's largest unions are still without new contracts. And both are threatening to shut down the airline in 199 if their disputes are NOT resolved. Minnesota Public Radio's Mark Zdechlik reports... | D-CART ITEM:6495 | TIME:7:54 | OUTCUE: soc