All those extra charges really add up. The airline industry made $27.1 billion in 2012 through various a la carte offerings, fees and frequent flyer partnerships.
A new global survey of 53 airlines found that some airlines make, on average, $30 per passenger from fees. In some cases, a la carte fees now make up 20% of a company's overall revenue.
"Once largely limited to low fare airlines, ancillary revenue has now become a financial necessity for airlines all over the globe," said the report's author, Jay Sorensen, an airline industry veteran who runs the consulting group IdeaWorksCompany.
Australia's Qantas Airways made $56.21 per customer -- the highest amount in the survey. That revenue came largely through selling frequent flier points to partners such as hotel chains and car rental companies.
Other fun facts from the report:
-- Southwest Airlines (Fortune 500) made $161 million by offering an "early bird" boarding service. ,
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