1) Song is no longer in business. It was absorbed back into Delta, from which it was born.
2) After watching Airline on A&E I love Southwest, but I have never flown on them. This is because I'm a 3-4 week booker, and by that point it costs too much to fly with them.
3) Alaska Airlines is awesome, 90%+ of flights are direct (non-stop), the drawback is... Price.
4) I also like United. United usually has some good deals, just not out of the airport I'm currently near.
5) When in Canada, it is AirCanada (or Jazz). In fact after my first term in college (just after 9/11), I found it was cheaper to fly from Toronto to Vancouver than it was from Detroit to Seattle, and thankfully my parents were in Toronto at the time, so they came to pick me up, and later took me to the airport.
6) I currently fly America West/US Air. I get my United frequent flyer miles while getting a great deal, and having a layover in Las Vegas!
TEG