This is actually a no-brainer. When an airline has a near-monopoly on flights out of a city, you'll have an airline that will charge higher fares. The exception, however, is an airport whose majority of flights are operated by Southwest. > Maybe losing an airport hub isn't so bad after all. Compare Nashville and > Cincinnati. > The average one-way domestic fare to fly out of Nashville International > Airport was $138, or about 16 cents per mile, in the second quarter of > last year, according to the U.S. Department of Transportation. > From Cincinnati, the average one-way fare was 71 percent higher at $236, > or 30 cents per mile.