Seven flights each from Charleston and Greenville-Spartanburg beginning March 13.

From Charleston (CHS):
3 x Baltimore
2 x Chicago Midway
1 x Nashville
1 x Houston Hobby

From Greenville-Spartanburg (GSP):
2 x Baltimore
2 x Chicago Midway
1 x Nashville
1 x Houston Hobby
1 x Orlando

For comparison, Southwest has up to 31 flights a day from Raleigh-Durham (RDU):
7 x Baltimore (6 x August – April)
4 x Chicago Midway (3 x August – April)
1 x Denver
1 x Ft. Lauderdale
1 x Las Vegas
4 x Nashville
4 x Orlando (3 x August – March)
4 x Philadelphia (3 x November – March)
1 x Phoenix
1 x St. Louis
3 x Tampa

Analysis: Midway and Baltimore come as no surprise. Those are among Southwest’s largest hubs. That both cities get seven flights a day is a bit of a shocker; the previous low for service to new cities was eight flights a day in Panama City, Florida. Houston service from both CHS and GSP is also surprising, especially as the far larger Triangle market doesn’t have Southwest nonstop service to Houston. (Nashville and Houston both allow Southwest to connect passengers to more westerly destinations.)

Not sure how much things are set in stone though. Southwest will obtain a large Atlanta operation from buying AirTran at some point in 2011. AirTran doesn’t serve CHS or GSP, so it’s easy to imagine that both cities could see that added in the future, though such service could come at the expense of Nashville and/or Houston flights.

Revised Southwest Charlotte schedule guess: After they come to town via the AirTran merger and things get integrated, of course. How about 4 x Baltimore, 4 x Atlanta, 3 x Midway, 2 x Orlando, 1 x Tampa, 1 x Denver.