Article Photos: Fees undermine fliers' ability to compare fares 1/1

FILE - This Dec. 21, 2012 file photo shows travelers walking to a ticketing desk at O'Hare International Airport in Chicago. For many passengers, air travel is only about finding the cheapest fare. But as airlines offer a proliferating list of add-on services, from early boarding to premium seating and baggage fees, the ability to comparison-shop for the lowest total fare is eroding.  (AP Photo/Nam Y. Huh, File)