Pinnacle Airlines Corp. said yesterday that it reached agreements, including additional financing, that will allow it to emerge from bankruptcy protection as a subsidiary of Delta Air Lines Inc., the Associated Press reported yesterday. Pinnacle said that it must file a reorganization plan acceptable to Delta and other creditors by Feb. 15. The company is trying to cut costs and streamline its fleet to 81 fuel-efficient planes that it would operate for Delta, which has been pressing Pinnacle to reduce costs.