A safety inspection of Alaska Airline's Boeing 737 Max 9 planes found "many" loose bolts.

The inspection came after an in-flight emergency in which a door plug came loose and window blew out.

The company's CEO told NBC News he was "angry" at the findings.

A safety inspection of Alaska Airline's Boeing 737 Max 9 planes revealed "many" loose bolts were found on the commercial airline's fleet.

The inspection was prompted by an in-flight emergency earlier this month, in which a door plug came loose, and a window blew out, causing Alaska Airlines flight 1282, heading from Portland to Ontario, California, to make an emergency landing and the airline to ground its fleet of 65 Boeing 737 Max 9 planes.

"I'm more than frustrated and angry that this happened to Alaska Airlines," Alaska Airlines CEO Ben Minicucci told Business Insider in a statement. "It happened to our guests and our people. My demand on Boeing is what are they going to do to improve their quality program in-house."

The CEO's comments were first reported by NBC News.

The CEO also said that the company would be sending its "audit people to audit their quality control systems" and oversee Boeing's production line.

Boeing declined to comment, referring BI to Alaska Airlines.
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