Boeing Finishes MAX 10 Tests as 737 Output Becomes the Cash Risk
Certification risk has fallen, but Boeing says stabilizing 737 production at 47 aircraft a month is taking longer than expected. A $715bn backlog only becomes cash when airplanes leave the factory.
Boeing has completed flight testing for the 737 MAX 10 and expects certification of the largest MAX variant soon, according to Chief Executive Kelly Ortberg. That removes a meaningful block from a programme that has spent years behind schedule.
For shareholders, however, Wednesday’s more important update came from the production system. Ortberg said Boeing is taking longer than expected to stabilize 737 output at roughly 47 aircraft a month. Only after that rate is stable does the company plan to move toward 52.
The two facts shift the balance of execution risk. MAX 10 certification still depends on the FAA and is not complete. But the company is now closer to having the aircraft approved at the same time that manufacturing throughput remains stubbornly below the rate Boeing wants.
Backlog becomes cash only through deliveries
Boeing ended the second quarter with a backlog of about $715 billion. That demand base is valuable because it gives the company years of prospective deliveries. It is not equivalent to current cash flow.
In the second quarter Boeing generated $631 million of free cash flow, an improvement that underscores how sensitive the investment case has become to delivery volume. Every aircraft that moves through final assembly, receives engines and interiors, clears inspections and is accepted by a customer converts a piece of backlog into cash. A production bottleneck delays that conversion even when demand is strong.
Current 737 constraints include wing flow, according to management commentary reported on Wednesday. That makes the production rate a system measure: Boeing needs suppliers, assembly operations and quality controls to hold the rate consistently before moving higher.
The MAX 10 milestone still matters. Certification would unlock the largest variant for customers and reduce one source of programme uncertainty. But finishing the flight-test campaign does not by itself improve factory cadence, supplier flow or delivery timing.
Boeing already has the demand. The near-term equity case now turns on whether it can hold roughly 47 737s a month and convert the order book into deliveries without destabilizing the production system. MAX 10 certification removes one programme obstacle; stable factory output determines how quickly the backlog reaches cash.