The FAIR Fees Act of 2026 would require the Department of Transportation to establish regulations prohibiting airlines from charging fees that are unreasonable or disproportionate to their actual costs. The bill covers a broad range of airline fees, including charges for changing or canceling reservations, baggage handling, seat selection, and priority boarding. The Secretary of Transportation must develop and publish these standards within 270 days of the law's enactment and update them every three years, with special consideration for allowing families with children under 13 to sit together without extra charges. The bill applies to all airlines holding federal air carrier certificates and affects millions of U.S. airline passengers who currently pay these fees. No specific funding amount is allocated in the legislation, though implementation would be handled by existing Transportation Department resources.