Not being all that sarcastic, if it's a last-minute thing why not just fly Southwest? You're talking about a 3.5 hour flight, and if you fly B.S. you'll be guaranteed to at least get a non-sucky seat.
Just a thought ... Loyalty goes in both directions.*
Cheers,
Adam
*Note: I haven't flown SWA all year, and am doing a BOS<>SFO 1 day trip to cement my 1K this year, so just being pragmatic ^