It was United. Flew U.S. Air to Italy last year. $200 each way. I believe they charge the same on domestic flights.

When we did Cycle Oregon a few years ago I flew with the bike because we were on Southwest and it was still $50.

One benefit to shipping is that if you are not riding from the airport, you don't have to schlep your boxed bike around and get ground transportation large enough to take the box. I hard a hard enough time getting a regular cab at MSO.