Nos. 99-2494, 00-1065. Argued June 8, 2000. Decided February 16, 2001. Petition for review of decision and order of National Labor Relations Board. ARGUED: Kenneth T. Lopatka, Matkov, Salzman, Madoff Gunn, Chicago, Illinois, for Overnite. William Maurice Bernstein, Senior Attorney, National Labor Relations Board, Washington, D.C., for Board. Carey Robert Butsavage, Butsavage Associates, P.C., Washington, D.C., for Teamsters. ON BRIEF: Kenneth F. Sparks, Christopher A. Johlie, Matkov, Salzman, Madoff