I did a little research and there seems to be some real price cuts on airline prices. Southwest has some really good fares as does United (mostly on later in the day flights), to Vegas.
Continental and Americian also seem to have matching fares when in the same market.
These are one way fares as an example
Baltimore to LV $99
San Dieago to LV $49
Philly to LV $138
Harrisburg to LV $158

These where on Tuesday thru thursday flights for the month of September.

Wonder if its in response to JetBlue's $599 deal.

Wish they would offer that deal in November!