Most generous carry-on allowances: biggest cabin bags first

Which airline allows the biggest carry-on?

Volaris (22.4×15.7×12.9 in) allows the largest included cabin bag, 129.5 cm (51 in) in total, followed by Southwest Airlines (24×16×10 in), Jet2 (56×45×25 cm) and Saudia (56×45×25 cm).

Measured as a box, the biggest volume belongs to Volaris: 22.4×15.7×12.9 in is about 74.3 litres.

10 of the 66 airlines reach 120 cm in total or more.

Who allows the heaviest cabin bag?

The highest published cabin weight limit among these airlines is 15 kg (33 lb), at Viva Aerobus.

9 airlines publish no cabin weight limit at all for their standard fare: Southwest Airlines, Air Côte d'Ivoire, Air Canada, Air Transat, American Airlines, Delta Air Lines, JetBlue, United Airlines and 1 more. Their rules only set a size.

Does a 22 × 14 × 9 in carry-on fit at the most generous airlines?

A hard 22 × 14 × 9 in bag fits at 27 of the 66 airlines. Where it fails, the blocking limit is the length at 32 airlines, the width or depth at 7 and the total size at 0.

Are the most generous airlines full-service carriers?

6 of the 10 airlines at 120 cm or more are full-service carriers and 5 belong to an alliance. By business model, the averages are regional airlines 105 cm (41.3 in) (1), hybrid airlines 116.3 cm (45.8 in) (5), full-service airlines 116.6 cm (45.9 in) (47) and low-cost airlines 118.7 cm (46.7 in) (13). The averages of business models differ by 13.7 cm (5.4 in), while individual airlines range over 24.5 cm (9.7 in).