Luggage fees are a quick and relatively easy way for an airline to make money, but the European discount airlines have turned it into an artform. If your carry-on tips the scale a few grams over the limit, the price of your air transportation can routinely double, thanks to their punitive and arbitrary baggage surcharges.
Kalevi Ruuska contacted me with an urgent problem recently. One of his friends was being asked to pay an odd cancellation fee by Air Berlin, and would not take "no" for an answer. The airline had hired a collection agency to pursue its claim.
Can an airline charge you for a ticket it canceled? If you said "not in America" you're right.