Inspections of Alaska Airlines’ fleet of Boeing 737 Max 9s has turned up “many” loose bolts, according to CEO Ben Minicucci. “I’m more than frustrated and disappointed,” he told NBC News, “I am angry. This happened to Alaska Airlines. It happened to our guests and happened to our people.”

The inspections follow a near-disaster on Alaska Airlines flight 1282 on January 5 of this year, when a blanking plate blew off the 737 Max 9 aircraft mid-flight. The loss of the blanking plate resulted in a rapid decompression of the plane, but fortunately did not result in loss of control of the aircraft or any physical injuries to passengers or crew.

The following day, the Federal Aviation Administration issued an Emergency Airworthiness Directive that has grounded all 737 Max 9s fitted with mid-cabin door plugs—other specifications of the plane use actual doors at that location in order to allow for more passengers in the cabin.

In addition to owners and operators of the Max 9 having to inspect their aircraft, the FAA also announced an audit of Boeing’s production line for the jet, “to evaluate Boeing’s compliance with its approved quality procedures.” In addition to investigating Boeing’s manufacturing processes and its production line, the FAA is also turning its attention to Spirit AeroSystems, Boeing’s subcontractor. Meanwhile, the National Transportation Safety Board is conducting an investigation into the incident.

Alaska, which has had to ground 65 aircraft, is not the only airline that’s angry with Boeing. United Airlines is now reconsidering an order it placed for 277 737 Max 10s, which it ordered in 2017 with the expectation that the aircraft would be delivered in 2020. “The reality is that with the Max grounding, this is the straw that broke the camel’s back with believing that the Max 10 will deliver on the schedule we had hoped for,” said Michael Leskinen, United’s CFO.

Boeing once had a stellar reputation in the aviation industry—pilots and aviation enthusiasts would even buy merchandise bearing the slogan “if it ain’t Boeing, I’m not going.” But those days are long gone.

Right-wing mouthpieces like Donald Trump, Jr and Elon Musk have blamed Boeing’s troubles on the practice of Diversity, Equity, and Inclusion, but there is a far more obvious cause than efforts to stamp out racism and sexism in the workplace—a new culture of management that took hold after Boeing merged with the failing McDonnell-Douglas company in 1997. Rather than engineering excellence, the new leadership was focused on cost-cutting and growing Boeing’s share price.

Tragically, this was evidenced by a pair of fatal crashes of 737 Max aircraft, one flown by Indonesia’s Lion Air in 2018, then a second operated by Ethiopian Airlines in 2019. As detailed at length by Maureen Tkacik in The New Republic, Boeing redesigned the 737 with larger engines and a new center of gravity to create the 737 Max.

But after pressure from one of its larger customers, Southwest Airlines, which didn’t want its pilots to have to spend time retraining, Boeing chose to essentially hide the fact that the new planes featured a Maneuvering Characteristics Augmentation System that, due to faulty sensor input, could crash the plane.