A Boeing cargo plane has been forced to land at Istanbul airport without its front landing gear, in the latest setback for the embattled plane-maker. No one was hurt in the incident, in a flight operated by the delivery company FedEx, Turkey’s transport ministry said. The Boeing 767 aircraft, flying from Paris Charles de Gaulle airport on Wednesday, informed the traffic control tower at Istanbul airport that its landing gear had failed to open and it landed with guidance from the tower, with emergency services standing by, the ministry said. The ministry did not say why the landing gear had failed but said it was examining the scene as part of an investigation Boeing cargo plane forced to land at Istanbul without front landing gear