(Offline)
While there are rip-off airports scattered across the country, most are concentrated in the Midwest and Southeast. Following Cincinnati and rounding out the top three are Cherry Capital Airport in Traverse City, Mich., and Tri-Cities Airport near Johnson City, Tenn. The Charlotte, N.C., Douglas International Airport, ranked seventh-worst, is the largest in the top 10.
The two most expensive large airports on the list, Cincinnati and Charlotte, are both big hubs in medium-sized cities, which means that their hub carriers end up with massive market shares and a prodigious pricing power. In Cincinnati, Delta Air Lines and its regional affiliates boast an 87% market share. In Charlotte, U.S. Airways and its partners enjoy more than 65% market share--and this number may be even higher due to U.S. Airways' regional affiliates that aren't big enough to show up in our data.
http://finance.yahoo.com/family-home/article/106617/Americas-Rip-Off-Airports
Great observation. They do tend to take advantage of the "captive audience", and it's not just airfares. Check out the ATM fees in an airport. Or just buy lunch or dinner in an airport! Or parking...parking at DFW Airport is $16 per day, and I'll bet it's not the most expensive airport out there.