# Panama Canal Transit Booking: Supplier Work > Panama Canal transit booking changes move vessel ETAs. How chandlers, bunker suppliers and agents re-quote and plan port call work around reallocated slots. URL: https://vesselreach.si/blog/panama-canal-booking-changes-supplier-work | Published: 2026-10-31 | Updated: 2026-11-01 | Industry news | Topic: Finding port-call opportunities ## At a glance - **What: What did the Panama Canal change?** The canal authority revised the criteria for reallocating cancelled or returned transit slots in booking periods 1A and 2, and updated its NetZero requirement. ([The Maritime Executive](https://maritime-executive.com/article/panama-canal-revises-transit-booking-system-and-updates-netzero-requirement)) - **Who: Who is affected by the booking changes?** Ship operators using the canal, and the port service providers at either end whose work depends on the vessel's ETA at the next port. ([The Maritime Executive](https://maritime-executive.com/article/panama-canal-revises-transit-booking-system-and-updates-netzero-requirement)) - **Where: Where did the related dockworkers action take place?** Dockworkers across 113 ports in 22 countries staged coordinated strikes and protests on 30 October, disrupting cargo operations and ferry services. ([gCaptain](https://gcaptain.com/anti-war-protests-spread-across-global-ports-as-dockworkers-target-arms-trade/)) - **When: When did the canal restore last-minute reservations?** The Panama Canal restored last-minute transit reservations for the Panamax locks on 21 October, after improvements in watershed levels. ([Splash247](https://splash247.com/panama-canal-reopens-last-minute-slots-amid-traffic-recovery/)) - **Why: Why did the canal restore the reservations?** The canal restored the service amid a traffic recovery, with transits up 4% in FY2026 and watershed levels improved enough to ease the drought-related restriction. ([Seatrade Maritime News](https://www.seatrade-maritime.com/maritime-transportation/panama-canal-sees-4-growth-of-transits-in-fy2026)) - **How: How does a late slot change reach a supplier?** A reallocated slot changes the vessel's ETA at the next port, which moves the delivery, bunkering or repair window that the supplier has planned around. ([The Maritime Executive](https://maritime-executive.com/article/panama-canal-revises-transit-booking-system-and-updates-netzero-requirement)) The Panama Canal has revised how it reallocates cancelled or returned transit slots and updated its NetZero requirement, according to [The Maritime Executive](https://maritime-executive.com/article/panama-canal-revises-transit-booking-system-and-updates-netzero-requirement) (31 October 2026). For maritime service providers, the practical effect is a booking calendar that can change late, so quotes and mobilisation plans must be built to move with it. ## What changed at the canal The canal authority has updated the criteria for reallocating transit slots that are cancelled or become available during booking periods 1A and 2, [The Maritime Executive](https://maritime-executive.com/article/panama-canal-revises-transit-booking-system-and-updates-netzero-requirement) reports. The same notice covers an update to the canal's NetZero requirement. This follows a recovery in canal traffic. The canal restored last-minute transit reservations for the Panamax locks on 21 October, easing a restriction introduced during this year's drought-related disruption, according to [Splash247](https://splash247.com/panama-canal-reopens-last-minute-slots-amid-traffic-recovery/) (26 October 2026). Transits through the canal grew 4% in FY2026, and the last-minute reservation system for the Panamax locks was reinstated after improvements in watershed levels, [Seatrade Maritime News](https://www.seatrade-maritime.com/maritime-transportation/panama-canal-sees-4-growth-of-transits-in-fy2026) reports (22 October 2026). ## Why slot allocation matters to port suppliers A canal transit slot sets a vessel's ETA (estimated time of arrival) at the next port. When a slot is reallocated late, the ETA can move by days, and every service tied to that port call moves with it. For a chandler, a late ETA change can mean a delivery run that no longer matches the ship's working hours. For a bunker supplier, it can mean a stem that has to be re-quoted or re-scheduled. For an agent, it can mean a PDA (pro forma disbursement account, the advance cost estimate sent to the owner or charterer) that has to be revised before the vessel arrives. The canal's own operating model shows how much planning sits behind a single transit. A 2021 study in the Journal of Navigation modelled the operative and routine learning curves for pilots performing manoeuvres in the locks and in transit through the expanded canal, noting that pilots take over the functions of the vessel's captain during transit ([Journal of Navigation](https://doi.org/10.1017/s0373463320000727), 2021). That level of specialisation is why slot timing is not a detail suppliers can absorb at the last minute. ## Other signals from the same week Panama is not the only place where supply timing is shifting. In Brazil, regular bioethanol bunkering has begun at the Port of Santos, following a pioneering operation in July through a partnership between Copersucar, CMA CGM, Bunker One, AGEO Terminais and Santos port interests, according to [The Maritime Executive](https://maritime-executive.com/article/regular-bioethanol-bunkering-begins-at-the-port-of-santos) (31 October 2026). New fuel grades create new handling requirements at the berth, from storage and transfer to documentation. Bunker suppliers and terminal operators serving Santos need to know which vessels are taking the new grade and when, not just which vessels are in port. Port operations were also disrupted on 30 October, when dockworkers across [113 ports in 22 countries](https://vesselreach.si/blog/113-port-dockworkers-strike-supplier-planning) staged coordinated strikes and protests, disrupting cargo operations and ferry services, [gCaptain](https://gcaptain.com/anti-war-protests-spread-across-global-ports-as-dockworkers-target-arms-trade/) reports (30 October 2026). [MarineLink](https://www.marinelink.com/news/dockworkers-strike-continues-friday-544040) reported the same action, describing disruption to shipping and ferries across Europe and beyond. The lesson for a supplier is that a port call can be disrupted by events that have nothing to do with the vessel's schedule. A work plan that assumes the berth window will hold is fragile. ## A practical response for chandlers, bunker suppliers and agents Treat the canal booking calendar as a live input to your sales plan, not a fixed schedule. 1. **Watch the booking periods.** Track which of your target vessels hold slots in periods 1A and 2, and flag any that are returned or reallocated. 2. **Quote with a re-quote trigger.** Build a clear point at which a bunker or chandlery quote is re-issued after an ETA change, and tell the buyer what that trigger is. 3. **Keep the PDA flexible.** For agents, a disbursement estimate that can be revised quickly protects the relationship when a slot moves. 4. **Contact before the slot is confirmed.** The earlier you speak to the technical or purchasing superintendent, the more room you have when the date shifts. For a wider view of how port call timing drives supplier demand, see [turning port call arrivals into a sales call plan](https://vesselreach.si/blog/port-call-arrivals-turn-etas-into-a-sales-call-plan), and for the cost side, [the economics of a port call](https://vesselreach.si/blog/the-economics-of-a-port-call-where-service-providers-fit). ## What this means for repair yards and marine service companies A repair yard or marine service company working on a canal transit schedule faces the same problem in a different form. A vessel that gains a last-minute slot may arrive earlier than planned, and a vessel that loses one may sit at anchor longer than expected. Both outcomes change the working window. A yard that can flex its berth plan around a reallocated slot wins the job; one that cannot may lose it to a competitor with more slack. The canal's traffic recovery also matters at the network level. A 2020 study in IEEE Access built a crude oil transportation network on the Maritime Silk Road using AIS (the Automatic Identification System, which broadcasts a ship's position and identity) data and found that the network's topology has a significant impact on its resilience ([IEEE Access](https://doi.org/10.1109/access.2020.3028214), 2020). A canal that is handling more transits changes the shape of that network, and with it the ports where work lands. ## How VesselReach helps VesselReach turns vessel movements at your target ports into targeted conversations with the people who decide. For a supplier watching the Panama Canal booking calendar, that means: - **Vessel intelligence before arrival.** VesselReach shows vessels near your selected ports and those scheduled or expected to arrive, which means you can contact the right company before the slot is final rather than after the ETA moves. - **Decision-makers by role.** VesselReach identifies operations, procurement, technical superintendents and commercial contacts behind each vessel, which means your re-quote reaches the person who can approve it. - **Email, WhatsApp and phone in one workflow.** VesselReach runs staged, personalised outreach across all three channels, which means a late ETA change can be handled with a follow-up rather than a fresh search. Book a VesselReach demo to see how the workflow maps to your ports. ## Frequently asked questions ### How does a Panama Canal slot change affect a ship chandler? A reallocated transit slot can move a vessel's ETA at the next port by days. A chandler may need to reschedule a delivery run, re-confirm the order with the ship and adjust the quote before the vessel arrives. ([The Maritime Executive](https://maritime-executive.com/article/panama-canal-revises-transit-booking-system-and-updates-netzero-requirement)) ### What is the Panama Canal NetZero requirement? The canal authority updated its NetZero requirement alongside the booking changes, according to The Maritime Executive. The notice covers the criteria for reallocating cancelled or returned slots in booking periods 1A and 2. ([The Maritime Executive](https://maritime-executive.com/article/panama-canal-revises-transit-booking-system-and-updates-netzero-requirement)) ### Is Panama Canal traffic recovering? Yes. Transits grew 4% in FY2026, and the last-minute reservation system for the Panamax locks was reinstated on 21 October after improvements in watershed levels, according to Seatrade Maritime News and Splash247. ([Seatrade Maritime News](https://www.seatrade-maritime.com/maritime-transportation/panama-canal-sees-4-growth-of-transits-in-fy2026)) ### What does bioethanol bunkering at Santos mean for suppliers? Regular bioethanol bunkering has begun at the Port of Santos after a July trial involving Copersucar, CMA CGM and Bunker One. Suppliers and terminals need to track which vessels take the new grade and when. ([The Maritime Executive](https://maritime-executive.com/article/regular-bioethanol-bunkering-begins-at-the-port-of-santos)) ### How should a supplier plan around a port strike? Keep a flexible work plan and contact the vessel's technical or purchasing contact early. The 30 October action across 113 ports in 22 countries disrupted cargo and ferry services, showing that berth windows can change without notice. ([gCaptain](https://gcaptain.com/anti-war-protests-spread-across-global-ports-as-dockworkers-target-arms-trade/)) ## Sources 1. [Panama Canal Revises Transit Booking System and Updates NetZero Requirement](https://maritime-executive.com/article/panama-canal-revises-transit-booking-system-and-updates-netzero-requirement), The Maritime Executive, 2026-10-31 2. [Regular bioethanol bunkering begins at the Port of Santos](https://maritime-executive.com/article/regular-bioethanol-bunkering-begins-at-the-port-of-santos), The Maritime Executive, 2026-10-31 3. [Dockworkers Strike Continues Friday Against Arms Shipments](https://www.marinelink.com/news/dockworkers-strike-continues-friday-544040), MarineLink, 2026-10-30 4. [Anti-War Protests Spread Across Global Ports as Dockworkers Target Arms Trade](https://gcaptain.com/anti-war-protests-spread-across-global-ports-as-dockworkers-target-arms-trade/), gCaptain, 2026-10-30 5. [Panama Canal reopens last-minute slots amid traffic recovery](https://splash247.com/panama-canal-reopens-last-minute-slots-amid-traffic-recovery/), Splash247, 2026-10-26 6. [Panama Canal sees 4% growth of transits in FY2026](https://www.seatrade-maritime.com/maritime-transportation/panama-canal-sees-4-growth-of-transits-in-fy2026), Seatrade Maritime News, 2026-10-22 7. [Assessment of the Resilience of a Complex Network for Crude Oil Transportation on the Maritime Silk Road](https://doi.org/10.1109/access.2020.3028214), IEEE Access, 2020-01-01 8. [Modelling operative and routine learning curves in manoeuvres in locks and in transit in the expanded Panama Canal](https://doi.org/10.1017/s0373463320000727), Journal of Navigation (Cambridge University Press), 2021-01-19 ## More on this topic Panama Canal transit booking changes matter to port suppliers because a reallocated slot moves the vessel's ETA at the next port. The canal revised how it reallocates cancelled or returned slots in booking periods 1A and 2, and updated its NetZero requirement, after restoring last-minute Panamax reservations on 21 October. Transits grew 4% in FY2026. The practical response for chandlers, bunker suppliers and agents is to track which target vessels hold slots, set a clear re-quote trigger for ETA changes, and contact the technical or purchasing superintendent before the slot is confirmed. Related searches: panama canal transit booking; bunkering; bunkering fuel; bunkering companies; shipping agent list; port call meaning --- VesselReach, built by CatalystIQ. CatalystIQ Data Classification and Analysis Services, Al Qusais, Dubai, P.O. Box 129882, United Arab Emirates. info@catalystiq.ae, +971 58 599 7894. Book a demo: https://vesselreach.si/#demo. Pricing: contact us for a quote (https://vesselreach.si/pricing).