Charted: SCFI Spot Rates vs Blank-Sail Shares on East–West Trades

The number that opens this file is 42%: in a single week of May 2025, that share of Asia–USEC capacity vanished — the sharpest blank-sailing print of the post-pandemic tariff shock, and yet spot rates kept falling through it. Container markets run on two dials that rarely move in lockstep: the Shanghai Containerized Freight Index (SCFI) and the share of blank sailings — scheduled sailings cancelled before departure. When demand softens, carriers blank voyages to shrink offered TEU; when demand firms, blanks shrink and rates can reprice even without dramatic cancellations. The operational question for East–West trades: how did Shanghai–US and Shanghai–EU spot prints move with blank shares, and when did blanks fail to defend a floor?

The dashboard pairs the two series as a rate-versus-capacity view. The spot metric switches among USWC, USEC, N. Europe, Med, and the SCFI composite; focus panels cover the dual-axis tape, a blank-by-spot scatter, a blank-mix breakdown, and peak-event bars. The lesson is deliberately two-sided: blank intensity can spike while rates still fall, and rates can rebound with only modest blank shares when cargo demand returns.

What SCFI measures — and what blanks measure

SCFI is a Shanghai Shipping Exchange weekly survey of spot ocean freight plus seaborne surcharges on major export routes from Shanghai [SSE SCFI]. Europe and Mediterranean legs are typically quoted in $/TEU; US west- and east-coast legs in $/FEU. It is quote-sensitive: it can lead or lag loaded cargo when carriers announce FAK levels that the booking market has not fully cleared.

Blank sailings are a capacity instrument. Tracker shops (Sea-Intelligence, Drewry Capacity Insight, Linerlytica and peers) count cancelled sailings or withdrawn TEU against the announced schedule. A 28% blank share on Asia–USWC means nearly three-tenths of that week’s scheduled Transpac west-coast capacity did not sail — not that rates must rise 28%. Mixing the two series without naming the corridor invents a false causal law.

UNCTAD’s maritime reviews supply the structural backdrop: fleet deliveries, schedule reliability, and chokepoint risk (Suez / Red Sea, canals) change the effective capacity that reaches destinations even when nominal sailings look intact. This post stays on the SCFI × blank tape; it does not restate the full fleet census.

The May 2025 tariff blank surge

The sharpest blank prints in the recent sample sit in the May 2025 tariff-adjustment window. Sea-Intelligence-style coverage put Asia–USWC blanks near 28% of weekly capacity in a peak week and Asia–USEC near 42% in another — demand expectations revised down so fast that carriers cancelled sailings in batches rather than sail half-empty [Sea-Intelligence May 2025]. Drewry’s blank tracker in the same season attributed roughly 56% of near-term blanked sailings to Transpac trades, with Asia–Europe around 31% and the transatlantic a thinner slice [Drewry Blanks 2025].

Spot did not treat those blanks as a hard floor. Nearby SCFI-style USWC and USEC prints still moved about −17% across the blank window in the event table — capacity came off, but the booking market kept repricing lower as importers paused or redirected cargo. The lesson is narrow: a 40% blank share is a demand confession, not a guarantee that next week's FEU print holds.

Linerlytica-style restatements of Transpac capacity removal after the tariff shock — on the order of ~200,000 TEU and dozens of ships shifted or idled — show how large the physical adjustment can be. Those TEU figures are illustrative tracker windows, not a full-year blank census. Use them for scale, not for precise P&L attribution.

Golden Week blanks and the Europe soft print

Seasonal blanks behave differently from tariff blanks. In the October 2025 Golden Week window, industry updates put roughly 11% of scheduled sailings cancelled across weeks 39–43, with Transpac absorbing about 53% of those blanks and Asia–Europe/Med about 31%. On the Far East–Westbound Europe leg, peak-week capacity blanks near ~25% coincided with SCFI Europe printing around $1,052/TEU — among the softest 2025 Europe levels cited in market updates, roughly ~47% below a mid-year local peak.

That pairing is the post’s second clock. Carriers blanked aggressively into the holiday demand dip, and Europe spot still printed soft because oversupply and rate competition outran the blank lever. A single soft Transpac week in the same season saw USWC FEU drop on the order of ~31% week-on-week and USEC about ~23% even while blank shares remained elevated. Blanks slowed the bleed; they did not erase it.

Post–Golden Week, the SCFI composite index rebounded to about 2,185 points by late October (with Europe leg prints recovering toward $2,226/TEU after GRI attempts) as blanks normalized toward high-single-digit scheduled shares [SSE SCFI]. The sequence — blank spike, soft print, then partial rebound — is why the dashboard's dual-axis tape matters more than any one week's blank percentage.

Correlation is soft — and lane-specific

Across the monthly tape, the analytical correlation between Transpac blank share and SCFI USWC sits only around +0.38 — positive but far from a tight rule. Asia–Europe blank share versus SCFI Europe prints closer to slightly negative (−0.12) in this sample: blanks rise into soft demand while rates keep falling, so the scatter cloud tilts the wrong way for anyone who expected blanks to lift Europe TEU prints one-for-one.

Scatter points in the dashboard make the geometry visible. High-blank months can sit at low spot levels (demand-gap blanks). Low-blank months can sit at high spot levels (firm demand, full schedules). The interesting outliers are high-blank / still-soft cells — May and October 2025 on Transpac and Europe — where capacity discipline arrived after the market had already priced weakness.

Treat these correlations as descriptive on this tape, not as structural elasticities. Weekly peak blanks smoothed into monthly averages mute the spikes that shippers actually felt when a single sailing disappeared from the booking screen.

Corridor scorecard

Read the table as a family of maps. USEC owns the blank-peak extreme in this sample. Europe owns the clearest soft-print coexistence with large seasonal blanks. USWC and Med sit between those poles. Firm 2026 prints (August-style USWC near ~$6,800/FEU and USEC near ~$9,500/FEU on WCI/SCFI-style paths) arrived with only modest blank shares — evidence that demand can reprice the market without a blank crisis.

When blanks work — and when they do not

Blanks work best as a short-horizon inventory tool: remove sailings for a holiday week, a port congestion pocket, or a sudden booking cancellation wave. They work poorly as a substitute for structural demand. When importers defer cargo after a tariff shock, blanking 40% of USEC capacity stops some empty slots from sailing; it does not recreate the missing bookings. When Asia–Europe is oversupplied after cascade redeployments, blanking a quarter of FEWB capacity can still leave enough tonnage to keep SCFI Europe soft.

August 2026-style firmness on Transpac — rates rising while blank shares stayed near high single digits — is the mirror case. Space tightened because cargo showed up, not because carriers cancelled half the string. Anyone watching only blank calendars misses the demand half of the clearing price.

Redeployment complicates the story further. Capacity pulled from Transpac can reappear on Asia–Europe or Med strings within weeks, so a blank on one corridor is sometimes a transfer, not a net global cut. Blank-mix pies in the dashboard (Transpac vs Asia–Europe vs transatlantic shares of blanked sailings) keep that geography honest: who cancels where is not the same question as how much net TEU left the water.

Caveats and how to use this tape

Several limits apply. SCFI is a Shanghai-export spot survey, not a global all-in contract index and not identical to Drewry WCI or booking-exchange prints. Blank percentages come from schedule trackers with differing universes (sailings vs TEU; announced vs executed). Monthly averages smooth peak weeks — the May USEC 42% print is a weekly peak, not a monthly mean. Red Sea routing and canal constraints change effective capacity without appearing as “blanks.” Confidence tags in the data module mark disclosed tracker windows versus estimated/carried monthly paths.

Use the dashboard to stress-test a claim, not to replace carrier advisories. If a procurement memo says "blanks will floor rates next month," ask which corridor, which blank share, and whether demand is pausing or merely seasonal. The 2025–2026 East–West tape says blanks are a real lever — and a frequently over-credited one.

Bottom line: Peak Asia–USEC blanks near 42% and Golden Week FEWB blanks near 25% show carriers will cut sailings hard. Soft SCFI Europe near $1,052/TEU and double-digit FEU drops inside blank-heavy weeks show the market can still clear lower. Watch SCFI and blank share together, by lane — never as a single slogan.