By knowing their way around ticket prices, schedules and flight availability, they have been able to hold their own, despite the airlines' efforts to sell straight to consumers and avoid paying the agents' 10% commission.

ECONOMIST: Electronic commerce

Even when you had a free ticket you often couldn't find availability, so only 6% of customers ever got an award, said Martin St.

WSJ: Best and Worst Airlines for Redeeming Points, Miles

Air France offers obese passengers booking a second seat up to 33 percent off the ticket price, depending on the type of seat and availability.

CNN: Airline policies juggle larger passengers