The Boeing Company (NYSE:BA) shares are trading lower today. The National Transportation Safety Board disclosed that executives from Boeing and Spirit AeroSystems Holdings, Inc. (NYSE:SPR) will testify at a hearing scheduled for Aug. 6-7 in Washington regarding the in-flight blowout on a Boeing 737-9 MAX in January. According to the NTSB, Boeing Commercial Airplanes’ Elizabeth Lund and Doug Ackerman will be among those testifying. The NTSB also noted that Spirit AeroSystems’ Terry George and Scott Grabon will testify. Also Read: Boeing To Acquire Spirit Aerosystems For $4.7B After Months Of Negotiations Several FAA officials are also set to testify at the 20-hour hearing over two days regarding the Boeing 737 MAX 9 door plug blowout, which involved four missing bolts, reported Reuters. The hearing will address 737 manufacturing and inspections, safety and quality management systems, Federal Aviation Administration (FAA) oversight, and issues related to the door plug’s operation. Related: Former Boeing Inspector Says ...