The data no travel desk computes — flight reliability by route, advisory diffs, entry-rule changes tracked to the day.
We read both governments' full advisory registers at once and lined them up country by country. The disagreements are not random: the extra U.S. caution lands almost entirely on Africa and the Caribbean, while the two capitals' 'Do Not Travel' lists — the gravest call a government makes — differ on just four places.
We read all 215 advisories the State Department publishes at once. The single top-level rating is a destination-wide floor, not the local reality: 19 of the 164 countries and areas badged Level 1 or 2 carry a 'Do Not Travel To' region in their text.
Read one country page and the update date looks like fresh local intelligence. Read all 226 at once and it resolves into a single note about British dual nationals, pasted across the world in a day — the third time since 2020 one sentence has landed on 200-plus pages at once.
We read all 595,195 June arrivals: the on-time score is set at the gate, not at touchdown. At O'Hare, where the taxi in averages 20.6 minutes against a national 9.0, 37.6% of late arrivals had touched down within 15 minutes of their scheduled gate time.
We read all 607,577 flights the 12 carriers filed with the DOT for June 2026. Southwest canceled 0.62%, tied for the second-lowest rate of any reporting carrier — but only 60.2% of its flights pushed back on time, the lowest of the 12, and 66.0% arrived on time, also the lowest. It rarely cancels, and it leaves the gate on time less often than any of the 12: two different reliabilities the word carries as one.
We read all 607,577 flights the 12 carriers filed with the DOT for June 2026. The two of American's three wholly-owned regionals that reported June flights — Envoy and PSA — canceled far more than its mainline, 3.4% and 6.9% against the mainline's 2.6%, even though, when they flew, their arrivals were no less punctual. The operating carrier is shown at booking, as DOT requires — but not that it can move the odds your flight operates at all.
We read the timestamp on every U.S. travel advisory in the government's own feed: 210 destinations, each carrying the date it was last reissued. Measured against the review cadence State commits to in writing — 12 months for Levels 1–2, six months for Levels 3–4 — 80 were past due, and the breaches cluster in the tier the department says it watches most closely.
Britain's Foreign Office publishes a dated change log for each country. Across all 29 Schengen states, its guidance on the EU Entry/Exit System moved on six shared dates between September 2024 and August 2026 — the wording word-for-word identical across the whole zone on five of them. Cyprus and Ireland, EU members outside the EES border zone, carry none of it. Only reading all 29 pages at once shows the edits are one central block, fanned out; the April 10, 2026 wave landed on the day the system went fully operational.
No desk reconstructs all 148,478 aircraft-days; we did, from the tail numbers, and read them at once. The first row of a plane's scheduled sequence departed more than 15 minutes late 9.3% of the time, the last row 31.3%. Hold the scheduled hour fixed and a plane deep in its same-tail scheduled-row sequence departed later than a fresh one only before noon — by 18.7 minutes at 10 a.m., near zero by evening. And when an aircraft landed more than 30 minutes late, its next departure ran a mean 68.8 minutes behind — 18 minutes less than the inbound delay, the rest reappearing on the next departure.
Reading all 611,735 scheduled flights shows why: 82% of American's cancellations fell on five days and 40% were at its Dallas/Fort Worth hub — and on those storm days every airline at DFW coded 'weather,' but American scrubbed 21% of its schedule there while Delta, United and Frontier cancelled 3 to 6%.
A country-by-country diff of the State Department's own advisory feed, captured a year apart, shows a shift concentrated in the Middle East: of the 20 destinations that changed level, 17 rose and 3 fell. Qatar and Kuwait rose two levels, and Bahrain, the UAE, Saudi Arabia, Oman and Jordan followed — six of the seven on the Arabian Peninsula, Jordan in the Levant. In the advisories' own text, most carry an ordered departure of U.S. personnel dated on or near March 2, 2026 — a shared marker of the same episode, not a stated cause of each level.
Across 604,346 completed US flights, 8.76 million minutes of delay split 40% inherited from an earlier flight and 33% generated by the airline itself. But the inherited-to-made ratio swings from 0.59 at SkyWest to 2.24 at Frontier — a 3.8× spread across 12 carriers — and it tracks a carrier's on-time rate at a correlation of −0.15. How an airline's delays break down says almost nothing about how often it runs late.
A diverted flight is neither a cancellation nor a late arrival, so it drops out of the 78.6% on-time rate entirely. Reading all 1,734 of May's diversions at once shows where they went instead: one in six was bound for Dallas–Fort Worth, and Oklahoma City was the overflow lot — per the carriers' own filings with the Department of Transportation.
On identical Atlanta–Newark flights, Delta schedules 134 minutes of block time and Frontier 158 — a 24-minute gap on a route the two actually fly about 6 minutes apart. Across 604,346 completed flights, the timetable carried roughly 185,000 hours of built-in cushion, per the carriers' own schedules filed with the Department of Transportation.
The federal on-time clock stops the moment a plane leaves the gate — the runway queue after that is invisible to it. Reading all 611,735 May 2026 flights: nationwide, 9.0% of departures that pushed back on time or early were not airborne for at least 30 more minutes. At Chicago O'Hare it was 33.3%; at St. Louis, 1.5%.
The advice to book the first flight of the day is folklore with a mechanism. Across all 571,924 arrivals the U.S. Department of Transportation logged in December, weather stayed a flat ~6–9% of delay minutes from dawn to midnight. What actually collapsed the on-time rate through the day was the late-aircraft cascade: 13% of the delay minutes on early-morning flights, 49% by evening — per the carriers' own filings.
Both airlines flew LaGuardia–O'Hare through the same storms. The gap wasn't the sky: 30 of Delta's 40 cancellations on the route were coded to the airline's own operations; every one of American's was coded weather — per the carriers' own filings with the Department of Transportation.