This large-scale study provides a general picture of web accessibility in the air transport industry serving Switzerland, with an emphasis on language-related issues and multilingual accessibility. A sample of 50 corporate home pages was evaluated for accessibility regarding their English, French, and German versions using a combination of assessment methods, namely automated testing on all sites and manual testing on a smaller selection of 10 sites. The web accessibility statements for the entire sample were also individually evaluated and compared with the results from the automated evaluation. Accessibility levels, as per the Web Content Accessibility Guidelines (WCAG) 2.1, varied depending on the language version of the site evaluated, with fewer errors related to accessibility on English-language versions and more errors in the French- and German-language versions. No correlation was found between the existence of an accessibility statement on a site and that site's level of accessibility in automated tests.