I participated in both the temp program at Envoy (when it was known as American Eagle), as well as the temp program at AA. 6 months each, which is the maximum allowed by IRS laws.
Given the very varied backgrounds of both Temp Workers, as well as the fact that AA is a very, very large company, it is difficult to say if someone will be made a full time offer as their time draws to a close. However, several common threads run through each the program:
a) You are responsible for promoting yourself. Involve yourself in meetings, go out of your way to introduce yourself to others, don't be content with just taking back office tasks and jobs which keep you out of sight of others. Six months flies by very fast, and it takes a LONG time to be hired at AA. Don't forget that being an airline, we are required to conduct detailed federal background checks and medical (drug testing), and this can delay the process.
b) Don't have your heart set on a "perfect" position at the airline, and neglect to apply to other, lower paying positions, assuming you want to work for AA. AA is definitely a hierarchical organization, any many, many managers started out in Reservations answering phones or throwing bags on the ramp in the hot sun/freezing snow. Don't think that having a college degree (even a double major) will allow you to bypass this. Again, remember you only have 6 months to find an opportunity, so apply early, apply often if you are a temp.
c) Currently as we navigate through the merger with US Airways there are a lot of full time employees who are being asked to relocate to different areas of the country. So you will have a lot of competition from folks who would normally not be looking for different positions, and many of them have decades of airline experience (15, 20, 25) years. Assuming you do not have an equal amt of a experience in your background, you might find it tough going.
I hope this was helpful. Respond back if you need additional clarification.