Southwest Airlines is offering passengers low Thanksgiving fares "for a short time." You must book by November 29, 2008 for travel between November 22 and December 2, 2008. A 3 day advanced purchase is required. Here a few sample fares from their website (roundtrip with taxes and fees included):

• November 24 - 28: Raleigh (RDU) - Baltimore (BWI), $235
• November 24 - 28: New York (ISP) - Pittsburgh (PIT), $290
• November 26 - 30: Chicago (MDW) - Indianapolis (IND), $161
• November 24 - 28: Denver (DEN) - Los Angeles (LAX), $199
• November 25 - 29: Philadelphia (PHL) - Manchester (MHT), $199

As always be sure to check other airlines to ensure that you are receiving the best fare before booking. Go to Southwest Airlines for full terms and conditions.