WASHINGTON (Reuters) -Boeing will add further quality inspections for the 737 MAX after a mid-air blowout of a cabin panel in an Alaska Airlines MAX 9 earlier this month, the head of its commercial airplanes division said on Monday. The planemaker will also deploy a team to supplier Spirit AeroSystems – which makes and installs the plug door involved in the incident – to check and approve Spirit’s work on the plugs before fuselages are sent to Boeing’s production facilities in Washington state, Stan Deal, president of Boeing Commercial Airplanes, said in a letter to Boeing employees. The new a…