Any charge that is not airfare is referred to as ancillary revenue for airlinesand they are cleaning up on it to the tune of $20 billion a year.

Any charge that is not airfare is referred to as ancillary revenue for airlines—and they are cleaning up on it to the tune of $20 billion a year. While consumers can avoid some fees, such as those for food, preferred seating, and wi-fi, the majority can't avoid baggage fees. What type of pricing strategies are airlines using? Is it ethical for airlines to charge baggage fees?