This annual publication provides the best single source of information and intelligence on ancillary revenue, a la carte services, and commission-based travel products, for the world's airline industry. Ancillary revenue for 81 airlines is presented as total revenue, a percentage of airline revenue, and on a per passenger basis. The results reflect 2019 disclosed financial activity and individual airline projections are offered for 2020. The narrative for each airline features disclosures made in financial filings, investor presentations, and information gathered from websites.  The publication has 143 pages.