I just flew with my dog in cabin from CA to DC but she's only 16 lbs.
As part of a project...I complied a list of airlines and their respective regulations and contact info (which I can send you if you like). Here's a basic rundown of what I found. Also note that if you can fit your dog under the seat, you are probably ok for most airlines. My Shimmer has crazy long italian greyhound legs, and she did fine under the seat for the whole flight. I flew United and they were awesome! The lady who checked us in (at Odd Size Baggage) even wanted me to take my dog out of the carrier so she could hold her!
Airlines with no weight limit: Airtran, Alaska, Continental, Delta, Horizon, and Southwest
With all of them, you can't let your dog out of the carrier onboard at any time and most make you leave them under the seat. You can't buy a seat for you dog...I tried. If you can squish your pup under the seat, please try it. I personally think that flying in cargo can be traumatizing for the dog because they are away from you in a completely new and scary environment. I also read some things on this website -->
http://www.petflight.com/pet-incidents that convinced me not to fly with my dog in cargo.
As yet another alternative, you can look into
http://petairways.com/ depending on where you are flying to in CA.
Let me know how it goes and what you decide!
Good luck,
Mel and Shimmer