Sources and method

The airlines’ pages

Liquids rules: governments and airports

How the figures are shown

• The airline’s unit comes first. US airlines print inches and pounds; airlines elsewhere print centimetres and kilograms. Where an airline prints both, both are shown as it prints them, even where its rounding differs from another airline’s (Delta and United give 14 inches as 35 cm, American as 36 cm).
• Conversions are marked “≈”. Where an airline prints one unit, the other is converted at 1 inch = 2.54 cm and 1 lb = 0.4536 kg: centimetres to the nearest whole number, inches to one decimal, kilograms to one decimal, pounds to the nearest whole number.
• Sizes are listed longest side first, as height, width and depth with the bag standing up, whatever order the airline writes them in.
• Rules are summarised, not reworded into new ones. Where an airline’s page is silent, on a weight limit for instance, the site says so rather than assuming one.

How the bag check works

A bag can be turned, so its longest side is compared with the longest limit, then the middle with the middle and the shortest with the shortest. Where an airline also sets a total, the three sides are added up and compared too. Each limit is taken in the unit the airline prints; if it prints both, a bag meeting either printed figure passes.

A bag over the limit by no more than unit rounding (0.5 cm or 0.2 in on a side) is shown as “right at the limit” rather than too big: 22 inches is 55.88 cm, which airlines round to 56. The check runs in your browser and sends nothing anywhere.

How the drawings are made

The comparison drawings show each limit’s front face, height by width, to the same scale from the same corner, the way airport sizers would nest. The airline pages draw each limit as a box in cabinet projection: height and width at full scale, depth at half scale at 30°, so the boxes on one page are true to each other.

Corrections

28 October 2026

A second, independent read of every airline page found no wrong size, weight or fee, but corrected some wording. United’s $75 gate price applies to Basic Economy bags. JetBlue’s peak dates are now listed in full, and its included first bag on some routes is noted. Alaska’s new fees start on 10 April 2026, not after it. Frontier’s free gate check is for full bins. Jet2’s hand luggage excludes infants. Ryanair’s and British Airways’ bags now use the airlines’ own names. easyJet’s airport excess weight is £12 a kilo. Wizz Air and Jet2 publish no fixed bag price, so the site no longer says theirs vary by route.