Boeing whistleblower raises new safety concerns about 787 Dreamliner assembly flaws

• Trouble seems never-ending for Boeing - new whistleblower raises safety concerns about 787 Dreamliner

• Whistleblower is engineer who worked on 787 assembly lines

• Says assembly process flaws could lead to planes breaking 'mid-air'

• Raises worries about quality control in Boeing's production

• FAA investigating issues raised by whistleblower