"Less-than-truckload (LTL) carrier ABF Freight System Inc. has filed suit in federal appeals court in a bid to overturn a lower court's ruling that ABF did not have legal standing to sue rival YRC Worldwide Inc., the Teamsters union, and Trucking Management Inc. for violating a wage agreement. Last November, ABF had brought suit against the parties, alleging that they had violated provisions of the National Master Freight Agreement (NMFA), the collective bargaining compact that governs most of the nation's unionized trucking companies."