Interesting study based on 6720 online booking queries submitted to the major airlines in March/April for the June-October period.

AA came in #6 out of 9 for the major domestic airlines, with awards available 62.9% of the time. It was followed down the list by AirTran, Delta, and US Air. Southwest was #1--99.3% availability.

http://aviationblog.dallasnews.com/a...-carriers.html