According to a Wall Street Journal report, the American carriers have made a lot of money thanks to add-fees – $22 billion in 2010.
For instance, Matt McCall, the president of Penn Financial Group reports in the following video that he had to “pay 50 dollars for 4 inches” exceeding the standard luggage size the night before.
Most people pay such add-fees as they do not want to change bags in the very last minutes. It depends on the airlines – as in the video – but the fee for overweight carry-on bags can be twice as expensive. Some passengers are willing to pay add-on fees if needed.
However some other passengers may not have time to perform the luggage change required, and they pay add-on fees just before departure. So they pay, and the airlines rake the add-on fees revenue which is to increase even further: