Fifty airlines post higher year-over-year results for “ancillary revenue as a percent of total revenue” in the 2021 edition of the CarTrawler Yearbook of Ancillary Revenue. The 136-page yearbook describes the 2020 ancillary revenue activities and results for 75 airlines. This year’s 75 airlines represent a very robust 68.9% of IATA’s worldwide airline industry passenger traffic for 2020. The list is a collection of the world’s best performing ancillary revenue airlines. Over all, ancillary revenue as a percentage of total revenue among the 75 airlines was 14.6% for 2020, which is a noteworthy increase above the 12.1% for 2019. In a year of gloom, the positive performance of ancillary revenue provided desperately needed support. An assessment of these results indicates ancillary revenue was the only financial success for airlines in 2020.