A new study looked at 50 airlines around the world, and found that they made billions of dollars in revenue from baggage fees and extra charges last year. The report finds the airlines' extra costs took in more than $22 billion in 2011, 66% more than in 2009.
The study says airlines are making more money by selling a growing array of products and services. The extra charges are known as ancillary fees. Airlines started adding the fees after the great recession.
United-Continental, Delta, American and Qantas made the most money of the major airlines in fees. Consultant firm IdeaWorksCompany and the travel technology firm Amadeus conducted the study.