Sources

Every number here comes from somewhere, and this page says where. Baggage figures were read from each airline's own published policy, never from an aggregator or a luggage retailer's blog, and each row in the tables carries the date it was checked.

Baggage

• easyJet — www.easyjet.com, checked 2026-08-23
• British Airways — www.britishairways.com, checked 2026-08-23
• Lufthansa — www.lufthansa.com, checked 2026-08-23
• Delta — www.delta.com, checked 2026-08-23
• United — www.united.com, checked 2026-08-23
• American — www.aa.com, checked 2026-08-23
• Southwest — support.southwest.com, checked 2026-08-23
• JetBlue — www.jetblue.com, checked 2026-08-23
• Air Canada — www.aircanada.com, checked 2026-08-23
• Emirates — www.emirates.com, checked 2026-08-23
• Qatar Airways — www.qatarairways.com, checked 2026-08-23
• Qantas — www.qantas.com, checked 2026-08-23
• Singapore Airlines — www.singaporeair.com, checked 2026-08-23

Not verified: Ryanair (blocked every automated request — main site, help centre and conditions of carriage alike.) Air France (allowance pages are fully javascript-gated on every regional domain.) Neither appears in the tables.

Jet lag

• Adjustment rates and melatonin guidance — CDC Yellow Book 2026, Jet Lag Disorder
• Adaptation timelines by direction — Frontiers in Physiology, 2019

Flight time

• Routing correction — ICAO Carbon Emissions Calculator Methodology v13.1, August 2024
• Taxi times — EUROCONTROL Data Snapshot #40
• The block-time model was fitted here against fifteen published schedules spanning 450 to 12,000 km; mean absolute error 12.9 minutes.

Fuel

• Real-world versus official consumption in Europe — European Commission, 2024, sample of 740,000 vehicles
• US real-world fuel economy — EPA Automotive Trends Report
• Gallon and mile definitions are exact by international agreement, not measured.

Time zones

Offsets come from the IANA time zone database carried by your own browser, which is why daylight saving is handled correctly without anything here being updated. One current caveat: British Columbia and Alberta moved to permanent offsets during 2026 and the database presently models both with a placeholder date, so a browser lookup for those two provinces can be wrong. Everywhere else in the list is unaffected.