Turkish Airlines has signed a memorandum of understanding with CFM International covering more than 600 LEAP-1B engines, Air Cargo Week reported.

That's a sizeable handshake. An MoU is not a firm purchase order; it's a documented intent that lets both sides plan capacity, slots and supply without lawyers getting in the way. The number alone points to a fleet trajectory well beyond simple replacement.

What does this change for shippers and carriers?

The LEAP-1B is the exclusive engine on the Boeing 737 MAX family. Turkish isn't quietly stocking a spares pool; it's locking in a multi-year engine supply line to feed narrowbody growth. That makes this as much a logistics story as an aviation one.

Turkish is one of the larger 737 MAX customers globally, with a fleet that runs into triple digits once options are counted. The carrier kept taking narrowbody deliveries through the post-grounding recovery while several European flag carriers throttled back. More LEAP-1Bs under MoU implies Turkish expects its narrowbody network to keep growing for at least another engine cycle.

CFM International is the GE Aviation–Safran Aircraft Engines joint venture that builds both the LEAP family and the older CFM56. Its position on the 737 MAX is exclusive: every airframe that leaves Boeing's Renton plant for a MAX customer carries LEAP-1Bs. Airlines typically fit one LEAP-1B per 737 MAX, so 600 engines roughly map to 600 airframes of forward demand.

Where the freight actually moves

LEAP-1B engines travel by air, not by sea. CFM operates dedicated 747-400F shuttles between Cincinnati/Northern Kentucky and European MRO hubs, moving finished engines and major modules. A backlog running into the hundreds translates into steady freight tonnage for forwarders handling time-sensitive, high-value, dangerous-goods cargo.

For an air cargo buyer, the indirect read is straightforward: more new engines mean more engine freight, more AOG movement, and a steadier pipeline of dangerous-goods capacity out of North American and European gateways. The direct impact on belly-cargo or freighter networks is modest, because engine flow runs on its own dedicated supply chain.

What CFM gets from the deal

Securing Turkish's narrowbody engine fleet through the next engine cycle effectively closes the door on Pratt & Whitney's geared turbofan inside the flag carrier's mainline narrowbody operation. That is the unspoken commercial point of an MoU at this scale.

The aftermarket revenue stream — overhauls, spare parts, life-limited-parts coverage — typically runs several multiples of the original engine sale over a fleet's service life. CFM is not just selling 600-plus turbines; it is selling decades of recurring service work tied to a single Istanbul-anchored hub.

How much of this turns into metal?

MoUs convert into firm orders at varying rates. Turkish's relationship with the 737 MAX platform has had its moments, but the carrier has remained a steady customer through the turbulence. A 600-unit MoU is large enough that even partial firm-up will move Boeing's official backlog by a noticeable margin.

Watch for the firm-order announcement — most likely at Paris Air Show or Farnborough — when the MoU tonnage converts onto Boeing's order book and CFM's published backlog.

Until then, this is a flag carrier planting a flag in familiar ground: the 737 MAX, LEAP power, and a long partnership with the GE–Safran joint venture. The question for shippers is not whether the engines arrive, but how steady the pipeline becomes once the firm orders are booked.