The union has been supervised by a court-appointed administrator ever since a consent decree with the Justice Department in 1989. A new election for Teamsters president was ordered by the federal government in August 1997, after federal official Barbara Zack Quindel's investigation uncovered a 'complex network of schemes' that involved the improper use of Teamster assets. Quindel found that the Carey campaign had received more than $220,000 in illegal contributions. Ultimately, the Independent Review Board found that more than $750,000 in union assets had been used in Carey's 1996 reelection campaign. During the 1998 election Tom Leedham, then-director of the Teamsters Warehouse Division, campaigned against James P. Hoffa. Campaigning to unite the union, Hoffa won the election. After having lost narrowly in 1996 to Ron Carey, Hoffa's new role as president was considered by Teamster members as a chance to rebuild the union. Hoffa was re-elected in 2001, 2006, 2011 and 2016 to five-year terms. "The first big test of the Hoffa administration" was the ratification in June 1999, of a four-year contract covering 13,000 carhaul members after an unprecedented amount of communication in the form of rallies, newsletters and a telephone hotline that was called more than 20,000 times over the course of the contract campaign. Solidarity rallies in Detroit, Los Angeles and Nashville attracted more than 6,000 carhaulers, family members and friends. The new contract averted a national strike and included pension gains, job security language and significant wage increases. "The new union leader is being closely watched in part because he has pledged to restore unity in Teamsters' ranks in the wake of a divisive campaign finance scandal." Two-thousand full-time jobs were created after Teamster pressure on United Parcel Service (UPS) as part of the commitment made by the 1997 contract. "My administration sent UPS management a very clear message. We expect UPS to meet their obligations under the 1997 agreement, and we will not tolerate company delays or numbers manipulation." In April 2000, more than 8,000 flight attendants at Northwest Airlines voted to ratify a new contract with improvements in compensation and retirement packages and ending a 3½ year labor dispute. A decade later, Northwest Airlines merged with Delta Air Lines and ceased operations on January 31, 2010. Casino workers in Detroit saw an end to biased wages and a disregard for seniority with their new collective bargaining agreement ratified in 2001. The new agreement initiated immediate wage parity between casinos in addition to wage increases in each year of the three-year contract.