I've put this in general chit chat as it's not necessarily Disney related.
To my American friends, what is your airline of choice and why? For our West Coast adventure next year we are looking at flying from San Fran to Las Vegas but have no idea which airline we should choose. There are a fair few around the same sort of price. Are there any bonuses for flying one over another? Are there any that include baggage or is that always extra?
Ones that I'm specifically looking at are;
Virgin America
US airways
United
Delta
American Airlines
Our Very Merry 24 nighter Nov/Dec 15
Watson's go West May 15
The one with all the birthdays Oct 14 4 Big Birthdays and a Vow Renewal thrown in
The OMG trip June 14 30th Birthday present from the hubs
Girly trip March 14 A last min cheapy week
September 13 our first all DVC stay
TR May 2013 the last min bargain trip offsite
Oct 2012 TR with a cruise!big family trip featuring the beach club, AKL, the dream and a villa offsite
TR on a budget May - June 2011offsite condo
TR Sept - Oct 2010 big family trip in an offsite villa



Keep checking, you never know! Sometimes it's better to go through the website directly, than through the travel sites. We flew Southwest for the first time this last trip. We always flew AirTran, but Southwest bought them out. I agree with what CCP had to say about Southwest. Here are a few observations we also noticed.... The Southwest planes are 3 seats each side, so 6 seats per row. Overhead compartments fill fast because there are more people on plane and less overhead storage. Not sure if you would need to pay extra for the early bird check in because I am pretty sure they allow medical boarding first. You would have to check on that. If I remember correctly, it went medical boarding and/or guests needing assistance, business/elite travelers, then those that paid early bird (which are section A) then family boarding (which is suppose to be for families with small children under the age of 4, but depending on gate agent they may allow older kids too) 
