More than three-quarters of the planes that Boeing furnished were 737 Max jets, a reminder of how integral its best-selling airline model has been to the company’s fortunes and challenges.

More than three-quarters of the planes that Boeing furnished were 737 Max jets, a reminder of how integral its best-selling airline model has been to the company’s fortunes and challenges.

Spirit has had an agreement in place since last summer to be acquired by its largest customer in a $8.3 billion deal. On the call, Boeing CFO Brian West said the company had delivered 33 737 Max ...