Likely in response to SkyBus' low price model, NW & SW airlines have slashed prices to amazingly new lows. NW is offering fares to/from Oakland, San Jose & Sacramento to Colombus for
$98+ tax roundtrip...and SW offering DING fares for $
30 each way. You must download DING from the Southwest website in order to see these fares. Most flights are for August and September.