[for FRIDAY MORNING! 11-20-98! Later today the National Mediation Board will announce the results a the vote that'll determine whether Northwest Airline airlines mechanics and aircraft cleaners will leave the Internatonal Assocaition of Machinists for a rival union. If the mechanics decide on representation by the Aircraft Mechanics Fraternal Association labor relations with Northwest could change signifcantly. Minnesota Public Radio's Mark Zdechlik reports...