TechBoy said:The problem with PIT was not that it lacked the population to support a hub. PIT has a significantly greater population than CVG and CLT, yet they can support a hub. The problem is that PIT didn't work as a US hub because it was too close to PHL.
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You may be right, but the airlines operating the CVG RJ hub and CLT are bleeding money. One is in Ch 11 and the other is close behind. I'm not as certain as you that either city can really "support" a hub.
The STL metro area is also larger than CVG and CLT (even larger than PIT) yet it couldn't support a successful hub. AA runs an RJ hub there now and WN has actually downsized ops there since the AA pulldown in 2003.
There are far too many hubs in this country, and things won't get better for legacy airlines until more of them close.
Of course, there are other large cities that either don't have hubs like BOS, SAN or SEA or have failed at supporting hubs as well, like CLE.
Recent metro area population data: http://www.demographia.com/db-usmet2003.pdf