Boeing is investigating a new problem with its 737 Max aircraft. A supplier has informed Boeing that two holes in the fuselage of some aircraft may not have been drilled exactly as required, the aircraft manufacturer announced on Sunday evening. Boeing currently estimates that around 50 aircraft that have not yet been delivered need to be reworked. The head of the passenger aircraft division, Stan Deal, emphasized at the same time that the “potential problem” did not represent an immediate problem for flight safety and that the aircraft model could remain in operation. Boeing’s quality control…