Commercial airliners could be hacked in flight by passengers using a plane's wireless entertainment system to access its flight controls, a US watchdog agency has warned. A new report from the US government accountability office identified the danger as one of several emerging cyber-security weaknesses that the Federal Aviation Administration must address."Internet connectivity in the cabin should be considered a direct link between the aircraft and the outside world, which includes potential malicious actors," the report said.The aviation regulator's administrator, Michael Huerta, concurred with the accountability office's findings and said the body had begun working with government security experts to identify needed changes."This threat will continue to evolve and it is something that needs to be at the forefront of our thinking," he told a Senate oversight panel.Government accountability office investigators spoke to cybersecurity experts who said onboard firewalls intended to protect avionics from hackers could be breached if flight control and entertainment systems used the same wiring and routers. ..