Aircraft maker Boeing has presented a plan to the United States’ Federal Aviation Administration (FAA) laying out steps the company intends to take to ramp up quality and safety controls following an incident in January on one of its 737 airplanes. In a statement on Thursday, Boeing chief executive Dave Calhoun said that the company had taken feedback from employees and independent experts into account for the plan, but did not provide information on the concrete measures that would be taken. The FAA had called on Boeing to submit a plan to improve quality controls after a piece of fuselage bl…