14 CFR Parts 382 and 399; 49 CFR Part 27 - Nondiscrimination on the Basis of Disability in Air Travel: Accessibility of Web Sites and Automated Kiosks at U.S. Airports
(ii) Characters. Characters displayed on the screen must be in a sans serif font. Characters must be 3/16 inch (4.8 mm) high minimum based on the uppercase letter “I.” Characters must contrast with their background with a minimum luminosity contrast ratio of 3:1.
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