Feds reject Teamsters' step toward strike at UPS - Yahoo Federal officials have rejected a bid by the Teamsters union to begin a 30-day countdown to a potential strike against United Parcel Service Inc. by the delivery company's aircraft mechanics. UPS spokesman Mike Mangeot said the National Mediation Board told the company of its decision Tuesday. The union's airline division had asked the board Friday to declare the talks stalemated. A Teamsters official, David Bourne, said the union was disheartened by the decision. He said the union was prepared to return to the bargaining table, "which we hope will be later this year."