A spokesman for the North Carolina Department of Labor said the agency would need until at least the middle of next month to finish its investigation into the July 31 death of an American Eagle fleet service clerk at Raleigh-Durham International Airport (RDU). The accident, which occurred on the RDU ramp between 8:30 and 9 p.m., involved a parked Embraer regional jet and a baggage tug driven by the deceased, 43-year-old Lufuluabo Kalonji. The labor department investigation will likely include an equipment inspection, a review of the airline’s safety program and a records check to determine whether Kalonji had received the proper training to operate the tug.