2. Airlines seek out new ways to save on fuel as costs soar The financial pain of higher fuel prices is particularly acute for airlines because it is their single biggest expense. Airlines pump about 7,000 gallons into a Boeing 737 and about 60,000 gallons into the bigger 747 jet. Each generation of aircraft is more efficient: an Airbus A330 long-range jet uses 38%

less fuel than the DC-10 it replaced, while the Airbus A319 medium range jet is 27% more efficient than the DC-9 it replaced.

Source: The New York Times, 11 June 2008