The mechanism: The F-35 program's original sin, by the Pentagon's own admission, was letting Lockheed Martin retain the technical data package under a 2001-era "total system performance responsibility" contract. Two decades later, sustainment costs have ballooned to a projected $1.58 trillion lifecycle estimate, full-mission-capable rates have fallen to roughly 25%, and GAO has logged 43 recommendations since 2014 — most still unimplemented. The Pentagon's fix, embedded in the Adaptive Acquisition Framework's Sustainment pathway, is explicit: build modular open-systems architectures, acquire complete technical data packages, and use dual-sourcing and subsystem-level competition to break single-vendor lock-in. That's not a press release — it's DoD's own acquisition doctrine now applied retroactively to a jet already in service. Every dollar of depot maintenance, software sustainment, or parts supply that DoD can competitively bid instead of sole-sourcing to Lockheed is a dollar pulled out of the highest-margin layer of the F-35 business — sustainment carries fatter margins than jet production because it's recurring, less capital-intensive, and historically uncontested.
Sole-Source vs. Full-and-Open: The Slow Bleed in LMT's F-35 Sustainment Machine
The Pentagon's Adaptive Acquisition Framework push for open architectures and competed sustainment work is a multi-year threat to Lockheed's highest-margin F-35 revenue stream, even as the jet's production backlog stays untouchable.

The production backlog is bulletproof. The sustainment tail — where the real F-35 margin lives — is exactly what Washington's acquisition reformers are now aiming at.
Who cashes in:
- LDOS (Leidos) — the government's go-to systems-integrator when it wants to insource or re-compete legacy aircraft sustainment once it controls the data rights; Leidos already runs a 10-year F-16 sustainment/engineering award for foreign military sales customers, the template DoD would replicate for F-35 depot and software work if data rights open up.
- RTX — Pratt & Whitney's F135 engine sustainment ($1.6B contract awarded in December 2025) is technically separate from Lockheed's airframe sustainment line already; any DoD push toward "power-by-the-hour" or performance-based logistics deals structurally favors the propulsion supplier that already operates outside Lockheed's TSPR umbrella.
- LHX (L3Harris) — a proven subsystem competitor with mission systems, avionics, and EW pedigree; the AAF's subsystem-level competition mandate is written for exactly the kind of modular, open-architecture bidder L3Harris has positioned itself to be across multiple platforms.
Who is exposed:
- LMT — F-35 sustainment (Lockheed's "Skunk Works"-adjacent, high-margin services book) is the direct target. Production backlog (17+ nations, multi-year procurement) is politically and contractually insulated; the recurring services tail is not, and that tail is worth more to margins over the plane's 30+ year life than any single production lot.
- BA — already structurally weaker in fighter sustainment share versus Lockheed and RTX; less exposed to this specific F-35 mechanism but a bellwether if DoD extends the same data-rights logic to legacy Boeing platforms (F-15EX, F/A-18).
The play: This isn't a production-halt story — LMT's F-35 backlog is durable and the jet is too geopolitically embedded (17 partner/FMS nations) to slow-walk. It's a margin-mix story that plays out over NDAA cycles and GAO report cards, not quarters. Watch for FY27 NDAA language on F-35 intellectual property rights, any new performance-based logistics RFPs that name second-source competitors, and Lockheed's services-segment margin trend line versus its aeronautics production margin — divergence there is the tell.
Source: original report ↗
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