Boeing's Spirit takeover costs rise by $455

Boeing's takeover of major supplier Spirit AeroSystems is proving more expensive than initially expected. The company now estimates that customer deals it inherited from Spirit will be $455 million more costly than first calculated, bringing the total estimated burden of those agreements to $1.52 billion.

This figure is roughly 43% above Boeing's estimate from the end of December 2025, shortly after the acquisition closed. The new cost assessment appeared in a Boeing filing and was examined in a September 3, 2026, Wall Street Journal report. Boeing's initial assessment understated the financial burden of fulfilling customer agreements already signed by Spirit.

Financial headwinds and delivery figures

The additional costs emerge as Boeing increases its overall aircraft delivery rate. Figures released on September 8, 2026, showed the company delivered 418 aircraft through August 2026, compared with 385 during the same period a year earlier. However, August deliveries dipped to 51 from 53 in July, with 787 handovers falling from 10 to just four.

Boeing has not identified which specific customers or aircraft programs are responsible for the $455 million cost increase. The company stated that its assessment remains preliminary.

Earlier warnings on integration costs

This finding follows an earlier warning about the expense of integrating Spirit. On March 17, 2026, Chief Financial Officer Jay Malave stated that higher-than-expected costs had pushed the commercial-airplane division's expected return to profitability into 2027, a year later than previously anticipated.

Malave addressed the issue at a Bank of America investor conference. "You don't get access to all the information until you actually close" the deal, he said, according to the Journal's coverage. He described the financial effect as a short-term headwind.

Scope of the acquired business

Boeing completed the approximately $8.4 billion takeover of Spirit on December 8, 2025. The transaction brought 737 fuselage production and major structures for the 767, 777 and 787 programs under Boeing's direct control. Approximately 15,000 employees joined Boeing through the deal.

Spirit's business, however, extended far beyond supplying Boeing. As part of the supplier's breakup, Airbus took over operations tied to its own aircraft when the transactions closed. Other manufacturers continue to rely on the businesses Boeing acquired.

Boeing stated at the time of the purchase that bringing its critical supplier under the same management would help improve quality and stabilize production. Spirit's defense business retained independent operations and governance to continue serving its military customers.