History shows that when major chokepoints close under geopolitical pressure, the reopening path is rarely linear. The 1980s "Tanker War" during the Iran-Iraq conflict saw the Strait of Hormuz operate under persistent attack for eight years before commercial traffic normalized. The 2019 tanker attacks and 2020 Soleimani escalation both produced sharp disruptions followed by partial recovery, but neither brought sustained closure. This time appears different in scale: visible commodity traffic through the strait collapsed to 2 ships on Monday, September 21, 2026, down from 10 the prior day, according to Kpler data reported by Reuters on September 22. Tuesday's count rose to 3 ships (all outbound), per Reuters September 23, but that remains well below the ~15 ten-day average and far below the pre-war baseline of approximately 125 large commercial vessels daily.
The two Monday vessels — a minerals-carrying Panama Supramax and a Liberia-flagged bulker — navigated via an unknown route. Fresh tanker attacks on LR Stephanie (Isle of Man crude carrier, entering Monday) and Al Maryah (Liberia LPG carrier, outbound Sunday) continued without tow, underscoring that the strait remains under active threat even as traffic thins. Bab el-Mandeb recorded 22 commodity vessels Tuesday (14 toward Red Sea, 8 toward Gulf of Aden), down from a ~26 ten-day average and still well below pre-escalation baselines of 60–80+ vessels daily.
Based on prior chokepoint closures, I believe the odds favor sustained diversion through Q4 2026 and into early 2027. The pattern is consistent: diplomatic noise rises, markets price in optimism, but visible traffic recovers slowly and non-linearly. For U.S. importers, warehouse operators, and procurement teams, the most likely path forward requires recalibrating three assumptions: bunker fuel cost trajectories, lead-time buffers, and Gulf-adjacent replenishment cycles. Planning on a near-term Hormuz reopening carries higher risk than modeling for sustained Cape diversion.
This is an operational planning guide for fuel risk, lead time management, and replenishment buffer design. It is not carrier routing instruction or legal advice.
Pattern: chokepoint closures follow predictable cycles, but reopening timelines do not
The principle underlying this analysis: major maritime chokepoints that close under geopolitical pressure typically remain constrained for quarters or years, not weeks. The reopening phase is non-linear, with false starts and reversals.
Historical evidence:
1980–1988 Tanker War (Hormuz): Over 500 merchant vessels attacked during the Iran-Iraq War. Commercial traffic continued but at reduced levels with convoy escorts, elevated insurance, and persistent attack risk. Full normalization took years after the 1988 ceasefire.
2019 Hormuz tanker attacks: Six tankers struck May–June 2019. Traffic thinned for weeks; insurance premiums spiked; some carriers avoided the strait. Partial recovery occurred, but elevated risk persisted through 2020.
2021 Suez Canal blockage (Ever Given): Physical closure lasted six days, but the knock-on effects — equipment malpositioning, port congestion, blank sailings — persisted for weeks. This was a logistics disruption, not a geopolitical closure, yet recovery was non-linear.
2023–2024 Bab el-Mandeb Houthi campaign: Red Sea transits dropped sharply in late 2023 and have not returned to pre-escalation levels as of September 2026. Carriers diverted to Cape of Good Hope; some resumed selective Suez transits with elevated premiums, but baseline traffic remains suppressed.
The current Hormuz situation shares attributes with the 1980s Tanker War (persistent attack risk, geopolitical stalemate) and the Bab el-Mandeb campaign (sustained low traffic despite diplomatic efforts). The most likely path is that visible Hormuz traffic remains in single or low double digits through Q4 2026, with any reopening heavily dependent on a durable diplomatic breakthrough — not just summit-week optimism.
Evidence: Monday 2 ships, Tuesday 3 ships, and fresh attacks
The Kpler data reported by Reuters provides the baseline:
- Monday, September 21: 2 commodity vessels entered the strait (a minerals Panama Supramax and a Liberia bulker), down from 10 the prior day.
- Tuesday, September 22: 3 commodity vessels transited, all outbound (including one Panamax tanker), per Reuters September 23 reporting at 0200 GMT.
- Ten-day average: ~15 commodity vessels daily, which is already well below the pre-war baseline of ~125 large commercial vessels daily.
AIS-off crossings remain excluded from these counts, so some traffic may be moving dark or under military escort. However, for planning purposes, AIS-off traffic is not a reliable assumption. If a vessel is moving without active transponders, carriers cannot guarantee schedules, insurers may not cover under standard terms, and importers cannot track cargo.
Fresh attacks (September 20–21):
- LR Stephanie (Isle of Man-flagged crude tanker, Universal Tanker): struck by unidentified projectile entering Hormuz on Monday, September 21. Two crew members sustained minor injuries. The vessel continued transit without tow.
- Al Maryah (Liberia-flagged LPG carrier, ADNOC Logistics): struck outbound Sunday, September 20. The vessel continued without tow.
Neither ship appears on Persian Gulf Shipowners Association (PGSA) non-compliant lists. Attribution remains unconfirmed, though the geographic pattern and timing align with prior Houthi and IRGC-linked maritime disruption.
Bab el-Mandeb context:
Tuesday's count of 22 commodity vessels (14 toward Red Sea, 8 toward Gulf of Aden) is down from a ~26 ten-day average and remains thin versus pre-escalation baselines. The dual constraint — Hormuz at 2–3 ships visible, Bab el-Mandeb at 22 — means alternative routing is not a low-friction substitute. Cape diversions avoid both chokepoints but add 2–3 weeks transit time and significant fuel cost.
Implication: do not plan lead times on a Hormuz reopen until visible transit recovers
As of Wednesday, September 23, diplomatic activity is high: Trump met with Iranian Foreign Minister Araghchi for approximately three hours (with Witkoff and Kushner), described the talks as having "a lot of momentum," and also threatened annihilation if no deal is reached. French President Macron stated that reopening Hormuz was the "main objective" of his Monday talks with Trump. Senior Iranian officials told Reuters that the strait could reopen within ~7 days if the U.S. ends its blockade, eases military pressure, and addresses Iran's asset and "resistance" front concerns. However, Al Arabiya reported (citing U.S. sources) that Washington has rejected lifting the blockade, leaving a significant gap between the parties.
The probabilistic judgment: Based on prior diplomatic cycles during the 2019 tanker attacks, the 2020 Soleimani crisis, and the ongoing Bab el-Mandeb campaign, I believe the odds favor sustained disruption through Q4 2026. Diplomatic optimism tends to spike around summits and UN General Assembly week, but concrete reopening requires durable agreement on core security and economic issues. The U.S. rejection of Iran's blockade-lift demand suggests that gap remains wide.
For importers, this means:
- Do not model purchase orders or inventory replenishment on a near-term Hormuz reopening. The most likely path is that visible traffic stays in single or low double digits for months, not weeks.
- Add 2–4 weeks to baseline transit times for any cargo transiting Hormuz, Bab el-Mandeb, or relying on Gulf-adjacent ports. Model Cape diversion as the baseline scenario.
- Track diplomatic milestones (e.g., Trump–Araghchi follow-up, Iranian President Pezeshkian's UN address on September 23), but do not revise lead times until visible traffic returns to 50+ ships daily for at least one full week. Anything less is a false start.
Bunker fuel: separate fuel from base rates and model for sustained elevation
Carriers typically pass bunker fuel cost changes through as separate line-item surcharges: Emergency Fuel Surcharge (EFS), Bunker Adjustment Factor (BAF), or similar mechanisms. When Hormuz throughput collapses and crude tankers face attack or diversion risk, delivered bunker fuel prices in Gulf ports and along Cape routes tend to stay elevated — even if global Brent futures moderate on diplomacy headlines.
The principle: Bunker fuel markets are regional and logistics-constrained. A drop in Brent crude futures (which traded near $101.70 on September 22, down from ~$108 the prior week on diplomacy hopes) does not automatically translate to lower delivered fuel at Singapore, Rotterdam, or Houston. When tankers divert around the Cape, fuel demand at Cape-adjacent bunkering ports rises, and Gulf delivery logistics tighten.
The playbook:
Separate fuel surcharges from base ocean freight in your quotes. Ask your carrier or forwarder for the explicit EFS/BAF line item, not just an all-in rate.
Do not assume fuel surcharges will drop with Brent futures. Track delivered bunker fuel spot prices at key refueling ports: Singapore Very Low Sulfur Fuel Oil (VLSFO), Rotterdam VLSFO, Houston Ship Channel. Ship & Bunker publishes daily bunker prices by port.
Ask for surcharge update frequency in your contract or booking confirmation. Some carriers adjust EFS monthly; others adjust bi-weekly or weekly when fuel markets are volatile.
Build fuel escalation buffers into purchase orders. If your PO locks a Delivered Duty Paid (DDP) or Cost, Insurance, and Freight (CIF) price with the supplier, negotiate a fuel escalation clause or leave a 5–10% cushion for unexpected EFS increases.
Historical pattern: During the 2019 Hormuz attacks, Brent spiked ~4% immediately, then moderated within two weeks as diplomacy progressed. However, carrier bunker surcharges remained elevated for 4–6 weeks after the attacks ceased, because delivered fuel logistics took longer to normalize than crude futures. I expect a similar lag this time, likely longer given the sustained multi-month closure rather than discrete attack events.
Lead-time buffers: pre-war assumptions are obsolete
When Hormuz throughput drops to 2–3 visible ships and Bab el-Mandeb holds at 22, transit time variability increases sharply. Vessels may wait for escort, reroute mid-voyage, or skip planned port calls. A typical Asia–Europe or Middle East–Europe ocean transit pre-war ranged from 2–4 weeks depending on origin and discharge port. Cape diversions add 2–3 weeks. Selective Hormuz transits with delayed convoy escort can add 1–2 weeks to baseline.
The operational checklist:
Add 2–4 weeks to your baseline transit time for new bookings. Do not assume selective Hormuz reopening until visible traffic returns to 50+ ships daily for at least one full week.
Ask your carrier for the actual routing, not just the ETA. Confirm whether the service transits Hormuz, diverts via Cape, or uses Suez. Each route has different risk and cost profiles.
Model two scenarios in your replenishment plan: (a) Cape diversion baseline (add 2–3 weeks), and (b) selective Hormuz reopening with 1-week escort delay (upside case). Use the Cape scenario for procurement commitments; treat the Hormuz scenario as upside that may not materialize.
Increase safety stock by 30–50% for SKUs sourced from or transshipped through the Gulf. The incremental carrying cost is cheaper than stockouts when transit variability spikes to 3+ weeks.
Front-load Q4 inventory if your business has seasonal demand (e.g., holiday retail, year-end construction materials). Cargo sailing in late September may not arrive until November under Cape routing. Book now, not in October.
Negotiate air freight options for critical SKUs. Air freight from Asia to the U.S. or Europe avoids the Hormuz/Bab el-Mandeb chokepoints entirely. It is expensive, but when ocean transit variability exceeds 3 weeks, air may be the only way to hit a hard deadline.
Pattern recognition: The 1990 Gulf War saw similar disruptions. Importers who front-loaded inventory in Q3 1990 absorbed the Q4 disruption; those who waited for "normal" Q4 bookings faced stockouts or air freight premiums that exceeded the carrying cost of early inventory.
Warehouse replenishment: shift from JIT to safety-stock-driven ordering
For importers who source finished goods or components from Middle East suppliers — or who rely on Gulf transshipment hubs like Jebel Ali (Dubai) or Khor Fakkan for consolidation — the Hormuz collapse creates a replenishment challenge. Weekly or bi-weekly just-in-time (JIT) replenishment cycles are no longer viable when transit times stretch by 2–4 weeks and attack risk keeps carrier schedules unstable.
The principle: When transit time variability doubles, replenishment frequency must halve and safety stock must double. This is not a permanent shift to pre-lean inventory models, but a tactical response to a multi-quarter disruption.
The replenishment buffer checklist:
Calculate your current replenishment cycle in weeks: average order-to-arrival time for Gulf-origin or Gulf-transshipped cargo. If it is currently 3–4 weeks, model it as 6–8 weeks under Cape diversion.
Add 4–6 weeks of safety stock for Gulf-adjacent SKUs. Use historical demand volatility (standard deviation) to size the buffer; do not guess. The formula: Safety Stock = Z-score × σ × √(new lead time in weeks). For a 95% service level (Z = 1.65) and doubled lead time, expect safety stock to increase by roughly √2 ≈ 1.4x, compounded by the longer absolute lead time.
Shift to monthly or bi-monthly replenishment orders instead of weekly. Larger, less-frequent orders reduce the number of in-transit shipments exposed to routing changes and lower per-unit logistics admin cost.
Diversify sourcing away from Gulf-only suppliers where commercially feasible. If a component or finished good can be sourced from Southeast Asia (Vietnam, Thailand, Malaysia) or South Asia (India, Bangladesh) with acceptable lead times and quality, initiate dual sourcing now.
Negotiate consignment stock or vendor-managed inventory (VMI) with Gulf suppliers if they have U.S. or European warehousing. This shifts the transit risk and carrying cost to the supplier while preserving short lead times for your warehouse.
Pre-position inventory in U.S. or European bonded warehouses if you import under deferred duty or FTZ programs. This decouples the customs clearance clock from the ocean transit risk.
Historical pattern: The 2021 Suez blockage taught a similar lesson. Importers with deeper safety stock absorbed the six-day closure and subsequent port congestion without customer impact. Those running lean JIT models faced stockouts or expensive air freight to recover.
Do not over-read: diplomacy noise is not the same as visible traffic recovery
As noted, diplomatic activity is high this week: Trump–Araghchi talks, Macron's Hormuz reopening push, Iranian officials citing a ~7-day reopening timeline if conditions are met. Markets may price in optimism, and Brent futures have moderated slightly.
However, I believe the most likely path is that visible traffic stays suppressed for months, not weeks. The U.S. rejection of Iran's blockade-lift demand (per Al Arabiya citing U.S. sources) suggests the core gap remains. Prior diplomatic cycles during the 2019 attacks and 2020 Soleimani crisis produced summit-week optimism followed by stalemate. The Bab el-Mandeb campaign has seen multiple diplomatic pushes without sustained traffic recovery.
For importers, the operational principle is: do not revise lead times or fuel assumptions on diplomatic headlines alone. Wait for visible traffic to return to 50+ ships daily for at least one full week before modeling a reopening scenario. Anything less is a false start.
AIS-off traffic may be higher than the 2–3 visible ships, but AIS-off vessels cannot be tracked, scheduled reliably, or insured under standard terms. Plan for what you can see.
The Bottom Line
History shows that major chokepoint closures under geopolitical pressure rarely reopen quickly or linearly. The 1980s Tanker War, 2019 Hormuz attacks, and ongoing Bab el-Mandeb campaign all exhibited persistent disruption despite diplomatic efforts. Based on those patterns, I believe the odds favor sustained Hormuz disruption through Q4 2026 and into early 2027.
Visible commodity traffic collapsed to 2 ships Monday (September 21) and rose to 3 ships Tuesday (September 22), both well below the ~15 ten-day average and far below the pre-war baseline of ~125 large commercial vessels daily. Fresh tanker attacks on LR Stephanie (entering Monday) and Al Maryah (outbound Sunday) continued without tow. Bab el-Mandeb held at 22 vessels Tuesday, down from a ~26 ten-day average, limiting alternative routing options.
Diplomatic noise is high: Trump met with Iranian FM Araghchi for ~3 hours Wednesday, described momentum, but also threatened annihilation; Iran cited a ~7-day reopening timeline if the U.S. lifts its blockade, but Al Arabiya reported Washington rejected that demand. The most likely path is that diplomatic optimism spikes around summits but visible traffic stays suppressed absent a durable breakthrough on core security and economic issues.
For U.S. importers and warehouse operations: do not model lead times or fuel assumptions on a near-term Hormuz reopening. Add 2–4 weeks to baseline transit times; model Cape diversion as the baseline scenario. Separate fuel surcharges from base ocean freight in quotes; do not assume EFS/BAF drops with Brent futures. Track delivered bunker fuel at Singapore, Rotterdam, Houston via Ship & Bunker. Increase safety stock by 30–50% for Gulf-sourced or Gulf-transshipped SKUs; shift from weekly to monthly replenishment cycles. Front-load Q4 seasonal inventory now; cargo sailing late September may not arrive until November under Cape routing.
Negotiate air freight options for critical SKUs. Diversify sourcing away from Gulf-only suppliers where feasible. Do not revise lead times until visible traffic returns to 50+ ships daily for at least one full week. AIS-off vessels cannot be tracked or insured under standard terms; plan for what you can see.
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Sources cited:
- Reuters, "Hormuz vessel traffic falls to two, data shows" (September 22, 2026): https://www.reuters.com/world/middle-east/hormuz-vessel-traffic-falls-two-data-shows-2026-09-22/
- Reuters, "Shipping traffic via Strait of Hormuz stays below 10-day average, data shows" (September 23, 2026): https://www.reuters.com/world/middle-east/shipping-traffic-via-strait-hormuz-stays-below-10-day-average-data-shows-2026-09-23/
- Marisks Intelligence maritime security reporting (cited via industry alerts, September 2026)
- Ship & Bunker bunker fuel prices: https://shipandbunker.com/prices
- Iran International, Al Arabiya (diplomacy / 7-day reopen framing, U.S. blockade rejection, September 23, 2026)