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ISTANBUL/NEW YORK — Turkish Airlines has finalized its largest-ever Boeing single-aisle order, committing to 100 Boeing 737-8 MAX aircraft with options for another 50 and rights to substitute the larger 737-10. The September 23 agreement ends negotiations that began in 2025 and gives Boeing a major strategic victory against European rival Airbus at one of the world’s fastest-growing global airlines.
But the deal comes with an important unresolved question: engines. Turkish Airlines has yet to announce an agreement covering maintenance of the CFM International LEAP engines powering the MAX, an issue serious enough that reports earlier this month suggested the airline could walk away. The signing also carries geopolitical significance. President Recep Tayyip Erdoฤan personally attended the finalization, while major Turkish purchases of U.S. aircraft have become intertwined with a broader effort to improve Washington-Ankara commercial and defense relations.
Boeing confirmed on September 23 that Turkish Airlines had purchased 100 737-8s and secured options for another 50 MAX aircraft. The agreement allows the airline to convert aircraft to the larger 737-10, giving Turkish Airlines flexibility to increase capacity on high-demand routes.
For Boeing, this is considerably more than another aircraft sale. It represents the biggest Boeing narrowbody commitment in Turkish Airlines history and strengthens Boeing’s position inside an airline that has simultaneously become one of Airbus’s most important customers.
For Turkish Airlines, the logic is equally strategic: it needs a very large number of airplanes.
Why does Turkish Airlines need another 150 aircraft?
Turkish Airlines is pursuing one of the industry’s most ambitious expansion programs.
The carrier’s 2033 strategy calls for a fleet of more than 800 aircraft and more than 170 million passengers annually. That compares with a current group fleet approaching 600 aircraft.
Its Istanbul hub gives Turkish Airlines an unusual geographic advantage. Europe, the Middle East, Central Asia, North and East Africa and large parts of western Asia are within narrowbody range. That makes efficient single-aisle aircraft particularly important to the Turkish business model.
The 737-8 is therefore not primarily an aircraft for glamorous long-haul expansion. It is a workhorse intended to feed Istanbul and operate short- and medium-haul services throughout Turkish Airlines’ enormous network.
The 737-10 option adds another dimension. The aircraft offers substantially more seats while retaining the economics and commonality of the MAX family, potentially making it useful on dense European, Middle Eastern and domestic routes.
There is one caveat: as of the announcement, the 737-10 had not yet completed FAA certification. Boeing CEO Kelly Ortberg said on September 16 that certification was expected “very soon,” with flight testing completed and documentation among the remaining work.
Why Boeing when Turkish Airlines already made a massive Airbus order?
This may be the most important commercial question surrounding the deal.
Turkish Airlines is emphatically not abandoning Airbus.
In December 2023, it placed an enormous Airbus order including 150 A321-family aircraft and 70 A350-family aircraft. Including purchase rights and other commitments announced around the transaction, the Airbus package established the European manufacturer as a central pillar of Turkish Airlines’ future fleet.
The new Boeing order therefore appears less like an Airbus defeat than a deliberate dual-supplier strategy.
For an airline planning a fleet exceeding 800 aircraft, depending entirely on one manufacturer carries risks. Aircraft manufacturers have multi-year backlogs; engines have experienced supply and durability problems across the industry; certification programs can slip; and production interruptions can suddenly change delivery schedules.
Having both Airbus A321neos and Boeing 737 MAX aircraft gives Turkish Airlines leverage.
It can negotiate with two manufacturers, diversify delivery positions and reduce the consequences of disruption at either Airbus or Boeing.
There is another advantage: competition.
When an airline needs hundreds of aircraft over a decade, maintaining credible competition between Toulouse and Seattle can improve negotiations over aircraft prices, financing, spare parts, training, guarantees and support.
In that sense, ordering Boeing aircraft after placing a huge Airbus order may be commercially rational even before geopolitics enters the discussion.
The elephant in the cabin: the 737 MAX reputation
The MAX name still carries baggage that few modern commercial aircraft programs have experienced.
Lion Air Flight 610 crashed in Indonesia in October 2018 and Ethiopian Airlines Flight 302 crashed in March 2019. Both aircraft were 737 MAX 8s. A total of 346 people were killed. The accidents led to the worldwide grounding of the MAX and unprecedented scrutiny of Boeing, the aircraft’s MCAS flight-control system and the certification process.
The aircraft returned to service after extensive design, software and training changes and regulatory reviews.
Then Boeing’s reputation suffered another major blow in January 2024 when a door plug separated from an Alaska Airlines 737-9 MAX shortly after takeoff. The FAA grounded 171 MAX 9 aircraft and subsequently found multiple instances in its Boeing and Spirit AeroSystems audit where manufacturing processes allegedly failed to comply with quality-control requirements. The regulator halted Boeing’s planned MAX production expansion and intensified factory oversight.
The regulatory picture has improved since then.
In July 2026, after what it described as eight months of data showing consistent production quality, the FAA restored Boeing’s authority to issue airworthiness certificates for all 737 MAX and 787 aircraft under continuing FAA oversight. The FAA had withdrawn Boeing’s ability to issue MAX certificates following the 2018 and 2019 crashes.
The MAX’s history nevertheless means Turkish Airlines is buying an aircraft family with a reputational history that is impossible to separate from the purchasing decision.
From an airline economics perspective, however, reputation is only one consideration. Acquisition price, fuel consumption, availability, fleet commonality, maintenance costs, residual value and delivery slots can ultimately carry greater weight in a multibillion-dollar procurement.
Turkish Airlines also already operates MAX aircraft. This is not the carrier introducing an unknown type into its operation.
The engine dispute may be more important than the aircraft price
Perhaps the most intriguing part of the announcement is what was notannounced. There is still no finalized public agreement concerning engines and engine maintenance.
The 737 MAX uses CFM International LEAP-1B engines. Unlike Airbus’s A320neo family, which offers airlines a choice between CFM LEAP-1A and Pratt & Whitney GTF engines, Boeing’s MAX is tied exclusively to CFM.
That changes the negotiating dynamics.
Turkish Airlines can negotiate hard with Boeing over aircraft, but once it chooses the MAX, it does not have a competing engine manufacturer it can select for those airplanes.
Aviation Week reported September 23 that Turkish Airlines had still not reached a solution concerning its request for an engine-maintenance agreement. The airline said it would provide information about the engine issue when available. That is not a minor footnote.
Over an aircraft’s lifetime, maintenance and engine overhaul expenses can amount to enormous sums. For a fleet potentially numbering 150 aircraft, differences in maintenance pricing, shop-visit intervals, spare-engine availability and long-term support can translate into billions of dollars.
The public signing of the airplane agreement while engine negotiations remain unresolved suggests that Turkish Airlines and Boeing found a way to separate the airframe decision from the engine-support negotiations. It also means the commercial story is not completely finished.
Is there a geopolitical deal behind the Boeing order?
This is where the story becomes more complicated.
There is no publicly available evidence establishing that Turkish Airlines was instructed to buy Boeing aircraft in exchange for a specific U.S. political or defense concession.
There is, however, substantial evidence that large aviation purchases formed part of a much broader period of commercial diplomacy between Ankara and Washington.
When the broader Boeing purchase was first announced in September 2025, Turkish Airlines said it intended to acquire as many as 225 Boeing aircraft: up to 75 787 Dreamliners and up to 150 737 MAX aircraft. The MAX portion remained dependent on successful negotiations with CFM over engines.
The timing was striking.
The announcement followed a meeting between Erdoฤan and U.S. President Donald Trump as Ankara and Washington were discussing defense, trade and energy relations.
At the time, Reuters reported that Erdoฤan’s Washington agenda included efforts to resolve Türkiye’s long-running exclusion from the F-35 fighter program and U.S. sanctions connected to Türkiye’s purchase of Russia’s S-400 air-defense system. Reuters also reported discussions involving Boeing commercial aircraft and billions of dollars in GE Aerospace engines alongside the broader diplomatic negotiations.
Separate reporting ahead of that meeting described plans involving hundreds of Boeing aircraft alongside fighter-aircraft negotiations and potential local-production arrangements worth more than $10 billion.
That does not prove a secret aircraft-for-fighters bargain.
It does show that commercial aviation and defense procurement were moving through the U.S.-Türkiye relationship at the same time.
For Washington, a Turkish Airlines Boeing order means billions of dollars of U.S.-linked exports and supports an American manufacturer competing directly with Europe’s Airbus.
For Ankara, major U.S. commercial purchases demonstrate the economic value of improved bilateral relations at a time when Türkiye continues to pursue unresolved defense issues with Washington.
And for Erdoฤan, being physically present at the signing turns what might normally be an airline procurement ceremony into something with unmistakable diplomatic symbolism.
Boeing versus Airbus — and Türkiye between America and Europe
There is another geopolitical layer.
Türkiye is economically intertwined with Europe, a NATO member with a complicated relationship with Washington, and a regional power that has maintained channels with Russia while pursuing closer economic relationships across the Middle East, Central Asia, Africa and Asia.
Turkish Airlines reflects that balancing strategy surprisingly well.
Its fleet is becoming a giant flying portfolio of European and American aerospace technology.
Airbus has secured huge Turkish commitments for the A321neo and A350. Boeing has now secured major commitments for the 787 and 737 MAX. Turkish Airlines has also evaluated Boeing’s delayed 777X, while examining regional aircraft from Airbus and Embraer.
Rather than choosing an American or European camp, Turkish Airlines appears to be ensuring that both remain strategically important suppliers.
That may be good airline procurement policy and good diplomacy at the same time.
The order is also important for Boeing
The Turkish agreement arrives at an important moment for the U.S. manufacturer.
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