The U.S. Postal Service posted a $2.2 billion net loss in its second quarter and said it might be unable to pay its debts by September. The agency, which has been battling falling mail volumes and competition from FedEx (FDX.N) and United Parcel Service (UPS.N), said it expects to hit its borrowing limit by the September 30 end of the fiscal year, and will have to default on payments to the federal government unless Congress intervenes. "The Postal Service continues to seek changes in the law to enable a more flexible and sustainable business model," said Chief Executive Patrick Donahoe in a statement. The Postal ... (full story)