It competes mostly with nonunion carriers, while its chief unionized LTL rival, YRC Worldwide Inc., has won separate labor concessions from the Teamsters that ABF charges has provided YRC with a distinct and unfair cost advantage. ABF attempted to wring similar benefits from its unionized workers but was rebuffed. ABF first sued in November 2010, alleging YRC's agreements with the Teamsters were illegally negotiated outside the auspices of the NMFA. ABF asked that the agreements be voided and that YRC's cost structure be returned to NMFA status. Separately, ABF sued YRC and the Teamsters for $750 million in damages. However, a federal judge in Arkansas has twice dismissed ABF's complaint. Despite the setbacks, the company continues to pursue appeals. Analysts have said ABF needs to bring down its labor costs if it is to remain competitive in an industry dominated by nonunion rivals.