Since the start of the year, Boeing (BA) has been on an exhausting rollercoaster ride. In January, the stock rallied from about $217.74 to a high of $254.35 before diving to a low of $187.72 after the company discovered a manufacturing flaw that affected about 25 undelivered 737 MAX aircraft. While it didn’t pose safety risks to commercial or military fleets, deliveries for the impacted aircraft were temporarily paused. www.barchart.com Unfortunately, that issue again raises the question of quality check ...