In late May 2026, UPS transported a cockpit canopy and weapons-bay door from a Royal Australian Air Force F-35. The parts were headed to the United States for inspection, possible repair, or disposal. Both components, supplied by Lockheed Martin, carried radar-absorbing material central to the aircraft’s low-observable characteristics. The shipment stopped in South Korea and was then routed to Hong Kong. Chinese authorities took possession and, as of late September 2026 reporting, had not returned the items. US congressional committees are investigating; the F-35 Joint Program Office has acknowledged a “shipment issue” involving unserviceable components and said it is working with partners to recover them and prevent recurrence. Australian Defence Minister Richard Marles confirmed awareness of the incident and cooperation with the US and Lockheed Martin, while stating his understanding that the parts were not sensitive. Lockheed has described them as unserviceable and low-risk for exploitation. The precise reason for the diversion remains unclear.
Why were an Australian F-35’s Canopy and Weapons-bay Door on a Plane to the US in the First Place?
Australia serves as a regional sustainment hub for F-35s in the Indo-Pacific. Certain specialised work — particularly involving stealth coatings and specific structural elements — still requires return to US facilities or highly controlled environments. Specifically, Australia has no facility that can repair canopies for its fleet of 72 F-35s.
The programme’s spares pool is owned by the Pentagon and managed by Lockheed Martin, which moves components using commercial shipping providers. To make that abundantly clear, the country at the centre of the region’s F-35 logistics still cannot fix one of the jet’s most important components.
Australia serves as a regional sustainment hub for F-35s in the Indo-Pacific. Certain specialised work, particularly involving stealth coatings and specific structural elements, still requires return to US facilities or highly controlled environments. Australia has no facility that can repair canopies for its fleet of 72 F-35s
So every unserviceable canopy from Australia, Japan, Norway, or anywhere else has to travel back to US-controlled repair channels. Each trip is a chance for a mistake, a theft, or a diversion to a place like Hong Kong. The exposure is built into the sustainment model. The Hong Kong episode is just what one failure looks like when it becomes public.
Canopies are also scarce. The US Government Accountability Office (GAO) has flagged them as a top driver of grounded jets, and a 2025 Lockheed study found 48 parts the supplier base can’t produce in sufficient quantity, canopies among them. When new parts are scarce, damaged ones get sent back for repair, which means more trips and more exposure.
What GAO’s June 2026 Report Shows
Defence analysts had warned about the F-35’s sustainment burden well over a decade ago. Rakesh Krishnan Simha, writing in Russia Beyond, a Russian state media outlet, highlighted the maintenance intensity of stealth coatings (requiring many man-hours per flight hour), the single-engine design’s implications for reliability in certain environments, and the risk that partner air forces would face grounded aircraft because critical work remained under US or Lockheed control.
Winslow T Wheeler, a former GAO analyst who became one of the jet’s most persistent critics, warned that its costs could cripple the forces that adopt the F-35.
Back then, both Wheeler and Simha were easy to dismiss as motivated or contrarian. GAO’s June 2026 report reads differently:
- The fleet’s mission-capable rate fell from 67% to 44%, and its full mission-capable rate from 38% to 25%. The Air Force’s F-35A dropped from 71.4% to 38.6% between FY2020 and FY2025.
- US lifetime sustainment costs are estimated at $1.6 trillion, and GAO says the F-35 has not met its performance goals.
- The programme office says it needs $13.7 billion more through fiscal 2031, about $7.3 billion of it for depot-level spare parts.
- Lockheed collected over $114 million in incentive fees from 2020 to 2023 even as readiness and parts-supply metrics stagnated or worsened.
- GAO says the Pentagon still lacks the technical data to maintain the jet independently.
- Programme officials say readiness will likely get worse before it improves, with gains possibly not arriving until late 2026 or later.
In June 2025, a British F-35B diverted to an airport in southern India after failing to return to HMS Prince of Wales. It sat on the tarmac for 38 days. The carrier’s own engineers couldn’t fix it, and a UK team had to be flown in on an RAF A400M. Six RAF personnel guarded it round the clock
Documented Sustainment Challenges
Spare-parts shortages, limited depot capacity, contractor dependence, and the classified nature of key technologies are the core drivers of low readiness. Canopies and other specialised components have been specifically noted as capacity-constrained items that contribute to aircraft downtime. The global spares pool is shared among US and partner nations, yet production has historically prioritised new aircraft deliveries over adequate spare-parts inventories. When local stocks run short, parts must move through an international network that can involve long transit times and specialised handling. Depot-level repair capacity has lagged, creating backlogs. Stealth-coating maintenance and certain classified diagnostic work require secure, climate-controlled facilities and restricted technical data; these cannot be performed routinely on open flight lines or by all partner maintainers. The result is aircraft sitting awaiting parts, specialised hangar space, or contractor support.
The programme has responded with updates such as the Global Support Solution (GSS) Reset, which seeks additional funding (on the order of billions through the early 2030s) for more spares, expanded depot capacity, and process improvements. The GAO has judged these steps positive but flagged continuing risks: industrial-base constraints on key parts, reliance on private-sector delivery of large volumes of material, and persistent cost pressures that leave services facing large annual gaps between projected sustainment needs and affordability targets.
Why the Australia Incident Matters Beyond Espionage Risk
The canopy and weapons-bay door episode is not primarily about whether China gained a decisive technological edge from two unserviceable parts; officials have downplayed the risk. It is a concrete illustration of how the sustainment architecture works in practice:
- Specialised components and coatings travel long distances under commercial logistics arrangements.
- Partner nations, even those designated as regional hubs, still route certain items back to the United States.
- A single routing anomaly can remove parts from the controlled chain for months.
- The same network that moves unserviceable items is the one operators rely on for serviceable spares and repairs.
Australia, with a hub and 72 jets, has no canopy repair. The US approved a $24 billion F-35 sale to Saudi Arabia in September 2026, and lawmakers are already worried about Chinese access to the technology. Owning the jet does not mean controlling its readiness. Washington decides who gets parts, where they’re repaired, and who can see the technical data
For air forces outside the continental United States, this creates inherent friction. High operational tempos, expeditionary deployments, or contingency operations amplify the problem: aircraft that cannot be fully maintained locally spend more time non-mission-capable. The classified status of stealth materials and certain systems limits the degree to which technology transfer or indigenous repair capability can be expanded without eroding the very advantages the aircraft is designed to provide.
Cost compounds the issue. Life-cycle sustainment estimates have long been in the trillion-dollar range for the planned US fleet alone; partner nations face their own per-aircraft operating costs that include contributions to the global pool and contractor support. When readiness remains constrained, the effective cost per available flying hour rises.
Two clarifications keep this fair. “Not mission capable” is not the same as “cannot fly in a war.” The Mitchell Institute’s Douglas Birkey has argued that F-35s performed well in recent operations when they were properly supplied with parts and skilled maintainers. The problem is the support system, not the airframe. But that same reading cuts the other way: prioritising a few tails for combat starves the rest of the fleet, and buyers outside the US have the least leverage over where the parts go.
A Window from Australia, and One from India
In June 2025, a British F-35B diverted to an airport in southern India after failing to return to HMS Prince of Wales. It sat on the tarmac for 38 days. The carrier’s own engineers couldn’t fix it, and a UK team had to be flown in on an RAF A400M. Six RAF personnel guarded it round the clock. A Royal Navy carrier air wing, the best-supported customer the US has outside its own forces, could not repair a hydraulic fault on a partner’s soil for more than five weeks.
The Australia-to-Hong Kong diversion is a visible symptom of the resulting logistics complexity. Persistent GAO findings on parts shortages, depot constraints, and readiness shortfalls show that the problem is systemic rather than a one-off error
Now add Australia, with a hub, 72 jets, and no canopy repair. Then look at who is buying next. The US approved a $24 billion F-35 sale to Saudi Arabia in September 2026, and lawmakers are already worried about Chinese access to the technology. Turkey was expelled from the programme in 2019 over its S-400 purchase from Russia. The pattern across all of these is that owning the jet does not mean controlling its readiness. Washington decides who gets parts, where they’re repaired, and who can see the technical data. Buyers depend on it, and it depends on a commercial logistics chain that just lost a canopy.
Broader Implications for Operators
The F-35 delivers advanced sensor fusion, low observability, and networking that many air forces judge essential for high-threat environments. Those capabilities come with a sustainment model that prioritises centralised control of sensitive technologies. The Australia-to-Hong Kong diversion is a visible symptom of the resulting logistics complexity. Persistent GAO findings on parts shortages, depot constraints, and readiness shortfalls show that the problem is systemic rather than a one-off error.
Efforts to increase spares production, expand depot capacity, improve forecasting, and reduce contractor dependence are underway. Whether they close the gap sufficiently for both US services and international partners will determine whether the aircraft functions as a high-availability combat asset or spends excessive time awaiting the specialised support its design demands. The missing canopy and weapons-bay door simply made that underlying tension harder to ignore.
Whether Hong Kong was a blunder or a well-run intelligence operation, the lesson is the same. An air force that cannot repair its own aircraft has security risks and readiness risks, and this week showed how the two feed each other.
The writer is a defence journalist specialising in military affairs, security policy and defence technology. He reports extensively on operation strategies, defence manufacturing initiatives and geopolitical developments across the Indo-Pacific region. The views expressed are personal and do not necessarily carry the views of Raksha Anirveda
