The Panama Canal Authority announced through an Advisory to Shipping that it is revising the transit booking allocation rules at the Neopanamax locks and updating participation requirements for its NetZero low-carbon vessel program. For Chinese exporters relying on the canal to connect with US East and West Coast ports, the restored priority for container ships should help stabilize sailing schedules.
What Happened
Under the advisory, the canal has revised the criteria for reallocating transit slots that are canceled or become available during booking periods 1A and 2. The changes take effect immediately and effectively restore the allocation criteria in place prior to July 2026.
Available slots during these periods will be offered through a special allocation process with priority given in the following order: container ships, LNG carriers, LPG carriers, and vehicle carriers or RoRo vessels. Within each vessel segment, Transit TEU Allowance (TTA) capacity will serve as the primary tiebreaker where applicable.
The same advisory also updated eligibility requirements for vessels transiting the waterway for the first time to participate in the NetZero program. Vessels must undergo a preliminary tonnage inspection by the canal's Admeasurement Unit, which may now be conducted outside Panama. Beginning November 1, 2026, owners, operators or authorized agents may request a preliminary inspection before the vessel arrives in canal waters, allowing the authority to obtain information in advance to calculate tolls, determine tonnage under the PC/UMS system, identify engine types and verify NetZero participation requirements.
Background
The Panama Canal had imposed strict transit limits and booking controls amid drought conditions, with allocation rules adjusted multiple times. The July 2026 change altered the reallocation order for canceled slots; restoring the earlier standard is seen by the industry as a return to more predictable scheduling as transit conditions improve. The NetZero program is part of the canal's push to encourage investment in low-carbon vessels, offering qualifying ships certain arrangements on tolls.
Impact on Shippers
On transit times, container ships regaining priority for booking slots should improve schedule reliability on all-water services to the US East Coast, as canceled or released slots are more likely to flow back to container liner services, reducing rollovers and delays caused by slots being taken by other vessel types.
On costs, canal tolls were not adjusted in this advisory, but with the restored allocation rules, the urgency of last-minute slot grabbing by liner operators may ease, potentially relieving pressure from peak-season surcharges and emergency booking fees. Customs clearance is not directly affected, but more stable schedules help shippers plan US customs clearance and last-mile pickup more accurately.
Recommendations
Shippers sending cargo to the US East Coast should stay in touch with their forwarders to confirm whether booked liner services have secured slots under the new rules, and build buffer time into bookings for schedule fluctuations. They should also watch for carrier notices on Panama Canal surcharges and verify vessel and voyage details on bills of lading and customs documents in advance to avoid discrepancies caused by schedule changes.