Some U.S. airports haven't regained all the service they lost in 2008 when airlines reduced domestic flying due to high oil prices. Large U.S. airports that have seen big reductions in scheduled seats on domestic flights: in September 2010 vs. September 2007

Airport Percentage change

Cincinnati -50%

Oakland -39%

Ontario, Calif. -39%

San Jose -29%

Kansas City -24%

Sacramento -22%

St. Louis -21%

Cleveland -20%

Las Vegas -19%

Tampa -19%

San Diego -18%

Raleigh/Durham -17%

Santa Ana (John Wayne) -17%

Chicago Midway -17%

Pittsburgh -16%

Albuquerque -15%

Orlando -15%

New York Kennedy -14%

Phoenix -13%

Newark -13%

Portland, Ore. -11%

Indianapolis -11%

Memphis -11%

Chicago O'Hare -11%

Houston (Bush) -10%

Nashville -10%

Source: USA TODAY analysis of airline schedule data from OAG -- Official Airline Guide