The Boeing Company (NYSE:BA) shares are trading lower premarket today. On Wednesday, the head of the National Transportation Safety Board (NTSB) stated that the mid-air emergency involving Alaska Air Group, Inc. (NYSE:ALK) Boeing 737 MAX 9 was entirely avoidable, as Boeing should have addressed unauthorized production work earlier. NTSB Chair Jennifer Homendy told reporters, “There have been numerous, numerous Boeing audits, FAA audits, compliance reviews, compliance actions plans, noting a history of an unauthorized work, unauthorized removals,”, reported Reuters. According to the NTSB, Boeing failed to document the removal and re-installation of the 737 MAX 9 door plug, a metal cover for an unused emergency exit, and does not know which employees were involved. The plug was delivered to Alaska Airlines missing four key bolts. Related: ...